The average service business responds to new leads 43 hours after they arrive. And 78% of marketers planned an agency review in 2025.
For Ad & Social Media Agencies Managing 10+ Clients
At 43 Hours, Every Client In Your Portfolio Is Losing Its Best Leads To Whoever Called First. MangoTeq Sentinel Answers Every One In Under Five Minutes.
Four minutes on the gap your account managers can’t see, and the conversation it causes with every client around month three.
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Watch: “The Follow-Up Gap Across Your Client Portfolio”
MIT and InsideSales.com tracked lead response times across thousands of businesses. A lead contacted within five minutes is 21 times more likely to turn into a booked appointment than one contacted after 30 minutes. The average service business responds in 43 hours. Run that gap across ten or more client accounts and it stops being one bad week. It's the reason clients leave at month four.
21x
More likely to qualify when contacted within 5 minutes
43hrs
Average service business lead response time
78%
Of marketers planned an agency review in 2025
The documented cost of a slow follow-up, multiplied across your portfolio.
→A lead contacted within five minutes is 21 times more likely to turn into a booked appointment than one called back after 30 minutes. MIT and InsideSales.com, Lead Response Management study.
→The average SME service business contacts new leads 43 hours after they enquire. Across a portfolio of ten or more clients, that gap isn't an isolated incident. It's happening on every account, every week.
→Acquiring a new client costs 5 to 25 times more than keeping one. A 5% improvement in retention can increase profits by up to 95%. Harvard Business Review / Bain & Company.
→One churned client at £3,000 a month is £5,600 in future profit gone at month four. Three a year is £16,800. Run that across a ten-plus client portfolio and the number stops being a rounding error.
What agencies ask before they start.
Straight answers.
Account managers notify clients. That's not the same as the client's sales team responding. The average response time from the client's side is still 43 hours. Sentinel fixes the gap between the lead arriving and the client's team picking up the phone. Your account managers don't need to change anything.
Each client onboarding takes one short questionnaire. Your account manager passes it to the client, the client fills it in, the account manager returns it to us. MangoTeq handles the rest. We never contact the end client directly. The relationship stays entirely yours at every stage.
This isn't a chatbot. Every message is written for that specific client, in their own voice, before anything goes out. The lead gets a reply that acknowledges what they asked for and moves them toward a booked appointment. A reply in five minutes beats silence for 43 hours, whatever the wording.
Notifications and responses are different things. A CRM tells the client a lead arrived. Sentinel responds to that lead within minutes via SMS, WhatsApp, or voice, and handles the full follow-up sequence. It works alongside existing CRMs. Nothing in the client's operation needs to change.
A lead that goes cold because nobody called for 43 hours looks identical to a bad lead in your client's reporting. You can't tell the difference until someone actually follows up. Ryan Unrau took 2,000 leads a roofing company had written off as dead, some three years old, sitting in a spreadsheet. He booked 40 appointments. Four jobs at around £12,000 each, £48,000 in revenue from leads they'd mentally deleted. What changed was follow-up, not the leads.
No lock-in. Sentinel works around each client's existing setup and can be removed without disrupting anything else they run. We get paid when it works for them. One recovered lead that turns into a job typically covers a month's running cost.
It depends on each client's lead volume and deal size, so we work it out per account. Options include a share of the extra revenue, a fee per booked appointment, or a flat retainer. We go through the numbers for your specific client base before anything is agreed.
How to evaluate this properly.
The best way to see how it works is to run it on your own agency's enquiries first. When someone fills in a form on your site, or responds to a campaign you're running for yourselves, Sentinel handles the response and the follow-up. You see the results on leads you already understand completely.
After 14 days you have the numbers: every lead that came in, how fast it was contacted, what happened in the conversation, how many booked a call. Decide from there, then roll it out across whichever client accounts make sense first.