Three months into a six-month retainer, the conversation on a Friday afternoon call goes quiet. The client has reviewed the quarter's numbers. The cost per acquisition is not where the original proposal said it would be. The agency walks through attribution, market shifts, platform updates and the discounting decisions the client made in March. The client is not unreasonable; the client is, however, no longer paying the invoice that landed two weeks ago. By the following Wednesday, a solicitor's letter has arrived, asking about wasted ad spend, lost revenue and the basis on which the original projections were given.
That conversation, in various forms, plays out across the UK digital agency market more often than the conference circuit suggests. Performance disputes rarely reach a courtroom; they almost always reach the consultancy's broker. This guide sits alongside our pillar on professional indemnity insurance for marketing and PR consultancies and our companion piece on defamation and reputation claims. It looks specifically at how contract and performance risk plays out in PPC, SEO, paid social, organic social, programmatic and integrated digital work, and how a well-placed PI policy responds.
Why digital agency disputes look different from other PI claims
Traditional PI claims often turn on a single discrete act: a misrecorded number, a missed deadline, an incorrect piece of advice. Digital agency disputes rarely look like that. They are usually cumulative.
The work is measurable in a way that creative work is not. Spend, impressions, clicks, conversions, position, engagement, view-through, sessions, revenue. Every component is tracked, and the tracking itself is fragile. Cookie deprecation, consent mode adjustments, iOS privacy updates, server-side tagging changes and platform-level attribution shifts can move the numbers without anyone at the agency or the client touching the campaign. When performance softens, the question of why becomes contested almost immediately.
The contracts are also written under pressure. Procurement-led documents stipulate KPIs, SLAs, audit rights, data ownership and liability caps. Agency-led documents stipulate scope, fees and assumptions. The version that gets signed is sometimes a hybrid of both, often without anyone reading the indemnity and IP clauses in detail.
The combination of measurable output and contested measurement is what makes digital performance disputes so common, and so distinctive from a PI standpoint.
The legal and commercial backdrop
Most disputes in this space are creatures of contract law more than tort. A client allegation that the agency failed to deliver against the agreed scope is, at heart, a breach of contract claim. Where the client also alleges that the agency held itself out as competent in a particular discipline and fell below that standard, professional negligence sits alongside the breach claim.
A handful of other legal regimes intersect with the work and occasionally drive disputes in their own right:
- The Consumer Protection from Unfair Trading Regulations 2008, where consumer-facing campaigns make claims that turn out to be misleading.
- The Privacy and Electronic Communications Regulations (PECR) and the UK GDPR, where pixels, retargeting, audience uploads or email sends touch personal data without an adequate lawful basis.
- The CAP Code and the ASA's enforcement remit, particularly for paid social, influencer and affiliate work.
- Intellectual property rights in code, creative, copy, audio, images and data assets used in campaigns.
- Platform terms of service, which are not legislation but which can drive account suspensions, ad disapprovals and lost spend with very real commercial consequences.
These regimes do not usually create direct claims against the agency from third parties; they create the backdrop against which the client's complaint sits. A campaign that runs into ASA difficulty is more likely to produce a contract dispute with the client about who should have flagged the issue than a direct claim from the regulator.
The most common dispute patterns
A handful of patterns appear repeatedly.
KPI shortfall against proposal numbers
The agency's pitch deck or proposal sets out target metrics: cost per acquisition, return on ad spend, lead volume, ranking improvements, follower growth, engagement rate. The campaign runs. The numbers fall short. The client argues the targets were commitments; the agency argues they were forecasts based on assumptions that did not hold. Whether the contract characterises the numbers as targets, forecasts, KPIs or guarantees determines a great deal of what follows. Most well-drafted agency contracts are explicit that performance projections are not warranties; many real-world contracts are not.
Scope creep and disputed change requests
The client asks for a small additional piece of work in a Slack message. The account manager says yes, because the relationship matters. Three months later, that pattern has produced a substantial volume of work for which no change order was raised. When the client questions an invoice, the agency points to the additional work; the client points to the original scope. Without a documented change control trail, this is a difficult dispute to win.
Attribution and reporting disputes
The client's CFO compares the agency's reporting dashboard with the client's internal analytics. The numbers do not match. Sometimes the discrepancy is a UTM tagging issue; sometimes a consent mode change; sometimes a different attribution model. The conversation moves quickly from a technical reconciliation to a question of trust. Reporting that has not been clearly documented, with the methodology explained in writing, is hard to defend after the fact.
Ad spend mishaps
A media buyer mistypes a daily budget. A campaign runs at ten times the intended spend before anyone notices. An automated bid strategy is launched without an exclusion list and spends heavily on irrelevant placements. A negative keyword list is dropped during a routine account refresh and search spend climbs without conversion. The size of the financial impact is often substantial relative to the agency's fees on the account, and the question of who carries the loss becomes acute. PI policies typically respond to the professional negligence element, subject to the terms; the client's expectation that the agency simply absorb the loss is often less straightforward than it sounds.
Retainer breakdowns and disengagements
A relationship sours. The client wants to leave; the agency wants to be paid for work in progress, notice periods and unamortised onboarding cost. Disengagement clauses, data handover obligations, IP assignment and run-off responsibilities for live campaigns all become contested. These disputes are often resolved commercially but can escalate quickly where the contractual position is unclear.
Account suspensions and platform issues
A Google Ads account is suspended for a policy issue arising from creative the agency drafted. A Meta Business Manager loses access to a pixel during a permissions reshuffle. A TikTok account is restricted following a content review. The client loses days or weeks of activity. The contractual question of who carries that risk depends heavily on the SLA, the warranties given by the agency and the underlying cause.
SEO and ranking disputes
An algorithm update reshuffles rankings. The client argues the agency's technical implementation or content strategy caused the drop; the agency argues the update was platform-driven and would have affected the site regardless. SEO disputes are particularly difficult because causation is genuinely contested in technical communities, let alone between agency and client.
Data and tracking failures
A measurement plan is implemented imperfectly. A consent banner blocks the tags that were supposed to populate the analytics. A new website launch ships without the tracking the agency configured being properly migrated. Weeks of data are lost. The client takes the position that decisions made during that period were taken on incomplete information and that the agency carries responsibility.
How PI cover typically responds
A market-standard PI policy written for a digital agency responds to civil claims arising from the insured professional services, including breach of contract claims tied to those services. That is the starting point. The detail matters.
Breach of contract cover. Many policies cover liability for breach of contract, but only to the extent of the liability that would have existed at common law absent the contract. Liability voluntarily assumed under a contractual indemnity that goes beyond that may not be covered. Where a client contract contains a broad indemnity, the policy may pick up part but not all of the exposure.
Performance warranties and guarantees. PI policies generally exclude liability for express performance guarantees that go beyond reasonable professional standards. A clause that guarantees a specific cost per acquisition, a particular ranking position, or a defined revenue outcome is precisely the kind of language that can fall outside cover. This is one of the most important reasons to have client contracts reviewed before they are signed.
Defence costs. As with all PI claims, the defence cost behaviour drives a lot of the policy's real value. Whether costs sit inside or outside the indemnity limit, and whether sub-limits apply to particular disputes, are structural questions worth raising at every renewal.
Subcontractors and freelancers. Digital agencies use them extensively, from media buyers to developers to creators. The policy should respond to the agency's liability for work done by subcontractors. Whether the subcontractors themselves carry adequate cover is a separate question, and one that should be addressed in the agency's onboarding process.
Data protection. Where the dispute has a data protection dimension, the interaction between the PI policy and any cyber or data liability policy becomes important. Coverage gaps are easy to create when the two are placed in isolation. We typically look at them together for digital agencies of any meaningful size.
Crime exposures. Invoice fraud, payment redirection and CEO-impersonation attacks against agencies are common. The losses sit primarily in cyber and crime cover rather than PI, but the boundary is not always clean and the policies should be read together.
The broader structural points about aggregate versus each-and-every limits, costs in or out of limit, dishonesty cover and run-off are covered in the pillar guide.
Practical steps that reduce dispute risk
Insurance is not a substitute for good operational practice. The agencies that produce fewer claims tend to share a few habits.
They invest in clear contracting. The master services agreement is reviewed by someone who understands the business, not pulled from a template. Performance metrics are characterised as targets or forecasts, with documented assumptions, rather than warranties. Liability caps are set at a level that reflects the fee, not the client's revenue. Indemnities are reciprocal where possible.
They run disciplined change control. Additional work generates a written change order, even where the relationship is warm. The account team understands that protecting the agency commercially is part of protecting the client relationship.
They document reporting methodology. Dashboards explain the attribution model. Discrepancies between platforms and the client's analytics are reconciled proactively, not when challenged.
They keep audit trails. Briefings, approvals, sign-offs and decisions are recorded in a place that survives an account manager leaving. A defence to a contract claim is much easier when the contemporaneous record is intact.
They review insurer-relevant processes before renewal. Sign-off processes, IP clearance procedures, data protection arrangements, subcontractor management and incident response. A strong renewal submission produces better terms than a thin proposal form.
None of this is glamorous. All of it makes claims easier to handle when they come.
The first steps when a dispute arrives
When a client raises a formal complaint, or when a solicitor's letter lands, the early hours matter more than they usually feel like they do.
Preserve the contractual chain, the briefing trail, the reporting history and the internal communications. Notify the PI insurer through the broker, even where the matter looks small; many policies require notification of circumstances, not only formal claims. Avoid substantive correspondence with the complainant until the insurer's panel position is clear. Consider whether the relationship can be preserved alongside the legal process, and brief the account team accordingly.
A broker who knows the agency well can usually help frame the notification carefully, manage the relationship with the insurer, and push for an early pragmatic outcome where one is available. That is, frankly, what most clients want from a broker in a moment like this.
Frequently asked questions
My contract guarantees a specific cost per acquisition. Is that covered by PI?
It may not be. PI policies typically exclude liability for express performance guarantees that go beyond reasonable professional standards. A clause that guarantees a specific commercial outcome is exactly the kind of language that can fall outside cover. Where possible, performance numbers should be characterised as targets or forecasts based on documented assumptions, rather than guarantees.
What about scope creep claims, where the client says we did less than agreed?
These are usually contract disputes, and PI cover typically responds to liability for breach of contract to the extent of the liability that would have existed at law. The defence is usually evidential: the original scope, the change requests, the approvals and the delivery record. Disciplined change control is the single most effective preventative measure.
Will my policy respond to a wasted ad spend claim?
Subject to the policy terms, where the agency is alleged to have been professionally negligent in the management of the campaign, cover may be available. The detailed position depends on the wording, the cause of the spend and the contractual relationship. Where the agency has voluntarily agreed to reimburse the spend without notifying the insurer, that can prejudice cover.
Are SEO ranking disputes really covered? Causation feels impossible to prove.
Causation is genuinely contested in SEO matters, and that is often the basis of a strong defence rather than a weakness. PI cover responds to the defence of the claim as well as any settlement, subject to the policy terms. The first step in any SEO dispute is usually a careful technical reconstruction of what was done, when, and what platform-level factors were at play.
The client wants to terminate without notice. What do we do?
The contract is the starting point. If termination clauses are clear, the question becomes commercial and operational: data handover, run-off responsibilities for live campaigns, outstanding invoices. If the client is alleging breach as the basis for termination, the matter shifts into the territory of a formal dispute and should be notified to the insurer through the broker.
Do we need cyber cover as well as PI?
For most digital agencies of any meaningful size, the answer is yes. PI responds to professional liability; cyber responds to first-party costs of an incident, business interruption, ransom and certain third-party data liabilities. The two policies are best placed together so the boundary is clean and there are no coverage gaps.
What about disputes with our own freelancers and subcontractors?
That is a separate area and typically not the focus of PI. Onboarding processes, written terms with subcontractors, and confirmation that they carry their own cover where relevant, are the most useful protections. The agency's PI policy responds to the agency's liability to its clients for work done by subcontractors, subject to the policy terms.
About Apex Insurance Brokers
Apex Insurance Brokers is a UK commercial insurance broker headquartered in Bristol, working with digital, marketing and PR agencies across the country. We are authorised and regulated by the Financial Conduct Authority, Firm Reference Number 724952, and registered at Companies House under company number 07014570. To discuss professional indemnity cover, a current dispute or a contract review, contact us on 0117 325 0027 or email info@apexinsurancebrokers.co.uk. This guide is general information only and not regulated advice; cover is always subject to underwriter assessment, policy terms and conditions. Last reviewed May 2026.