The information gap between agencies and clients is where bad agencies live. Here's how to close it, four red flags, and the checklist for a trustworthy partner.
By Jack Goldsmith — Founder & Performance Marketer, Social Surge · 9 July 2026
How do you know if a marketing agency is lying to you?
The clearest warning signs are vanity-metric reporting, vague deliverables, refusing you admin access to your own ad accounts, and long contract lock-ins. A trustworthy agency reports revenue and ROAS, publishes its pricing, gives you full account ownership and works on rolling monthly terms.
Most business owners can't tell a great agency from a confident one, and the industry is built to keep it that way. Agencies control the reporting, own the jargon and often hold the keys to your own ad accounts. That information gap is where bad agencies live. This guide closes it: the specific red flags to watch for, why they exist, and what the honest alternative looks like.
If your monthly report leads with impressions, reach, clicks or "engagement", ask yourself one question: can I pay my suppliers with any of those? Vanity metrics are numbers that go up easily and mean almost nothing commercially. Any agency can buy you a million impressions, cheap traffic is the easiest thing in advertising to produce.
What matters for an e-commerce business is a short list: revenue, return on ad spend (ROAS), cost per acquisition (CPA) and conversion value. If those numbers are good, an agency leads with them. When a report buries revenue on page six beneath a wall of reach charts, it's usually because the revenue story isn't worth telling.
Reports that open with revenue and ROAS, compare against previous periods honestly (including the bad months), and connect every metric to money. If you can't explain your agency's report to your accountant, the report isn't for you, it's for the agency.
"Ongoing optimisation." "Campaign management." "Strategic oversight." These phrases appear in thousands of agency contracts and commit the agency to precisely nothing. Vagueness isn't sloppy writing, it's deliberate. A contract that never defines the work can never be breached by not doing it.
Ask a simple question before signing: what exactly will you do in month one, month two and month three? A competent agency can answer specifically, tracking audit, feed rebuild, campaign restructure, search term reviews, weekly reporting cadence. If the answer is a word cloud, walk away. And once you've signed, ask for change history: Google Ads logs every modification made to an account. An agency doing real work has nothing to hide there.
This is the biggest one, and it's shockingly common. Some agencies run your advertising inside their ad accounts, or grant you a filtered dashboard instead of real platform access. The stated reason is usually "proprietary setup". The actual reasons are worse: you can't verify their numbers, you can't see how your budget is spent, and if you leave, you lose your account history, the years of conversion data that makes advertising work. That's not a service model; it's a hostage situation.
The rule is absolute: you should own your ad accounts, and you should have admin access to them. The agency works inside accounts that belong to you. Any agency that resists this is telling you exactly what kind of relationship it wants.
Six-month and twelve-month minimum terms are sold as "commitment to the strategy". Think about the incentive structure they create. An agency on a 12-month lock-in gets paid whether it performs or not; its retention team is its legal department. An agency on rolling monthly terms has to earn your business every single month, its retention strategy is results.
There's a legitimate version of the commitment argument: PPC genuinely does take 60-90 days to show meaningful improvement, and judging an agency after three weeks is unfair. But that's an argument for patience, not for contracts you can't exit. Good agencies solve it with honesty about timelines, not lock-ins.
Flip every red flag and you get the checklist:
None of this is radical. It's just what service businesses look like when they expect to be judged on results. We built Social Surge, a PPC-only agency for UK e-commerce, around exactly this checklist, because we'd seen what the alternative does to businesses. Whether you work with us or anyone else, take the checklist with you.
Refusing to give you admin access to your own ad accounts. It prevents you verifying results, hides how budget is spent, and means you lose your account history if you leave. You should always own your ad accounts, with the agency working inside them.
Impressions, reach and clicks have diagnostic value for marketers, but they should never headline a report. For an e-commerce business, results mean revenue, ROAS, CPA and conversion value, metrics that connect directly to money.
Rarely. PPC legitimately needs 60-90 days to show meaningful results, but that justifies patience, not a 12-month lock-in. Rolling monthly agreements keep the incentives honest: the agency must perform every month to keep your business.
Ask for specific numbers, the timeframe, and how they were measured. A credible agency can show platform data (anonymised if needed) during an audit or sales call. Be sceptical of logo walls and percentage claims with no baseline.
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