MIT and InsideSales.com tracked what happens between a lead arriving and a business answering it. The ones who answered within five minutes converted 21 times more often than the ones who waited half an hour. The average service business waits 43 hours. That gap is where your clients' marketing budget goes to die, and it has nothing to do with the campaigns you're running for them.
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
Before Sentinel, And After
→Before: a lead fills out a client's form at 9pm on a Tuesday and nobody sees it until Wednesday lunch. After: that same lead gets a reply in their own inbox within five minutes, in the client's name
→Before: the client blames the agency for poor lead quality. After: the same leads convert at 21 times the original rate, because someone finally answered fast enough to matter
→Before: a client churns at month four and £5,600 in future profit goes with them. After: the month-four conversation doesn't start, because the numbers the client sees every month already moved
→Before: each account manager chases follow-up across ten or more clients by hand. After: MangoTeq Sentinel does the chasing automatically, invisibly, across your entire portfolio
“Before We Bring This To A Client...”
The questions agency owners ask us directly, and the honest answers.
Every message goes out in your client's name and voice, not as a generic auto-reply. We build the templates from your client's existing copy: their tone, their offer, their booking flow. The lead sees a fast, specific response from the business they contacted. They never see MangoTeq.
GoHighLevel is a platform your clients still have to operate themselves. Sentinel is a managed service that sits alongside it. Nobody on the client's team has to learn new software or maintain another dashboard. The follow-up happens whether or not anyone logs in that day.
Sentinel works across WhatsApp, SMS, voice, and email, and hands off to a live conversation the moment a lead is ready to book. A five-minute message isn't meant to replace your client's sales process. It's meant to keep the lead warm long enough for that process to happen at all.
Ryan Unrau, a database reactivation specialist, took a £40 million roofing company's list of 2,000 leads written off as dead. His team re-engaged them and booked 40 appointments, which turned into 4 jobs worth roughly £12,000 each: £48,000 from leads the company had already given up on. The leads weren't the problem. The follow-up was.
Yes, and most agencies start that way. There's no lock-in contract, and Sentinel can be removed from a single client's account without touching anything else you run. Once the numbers move for that client, the case for the next nine makes itself.
Pricing is performance-aligned: revenue share, per-appointment, or a fixed retainer, depending on how your client's business is structured. Most agencies build it into their existing retainer as a margin line, not an extra invoice the client has to approve.
Ready To Close The 43-Hour Gap?
See how Sentinel handles every channel, every client, and every after-hours lead across your portfolio, without adding headcount or changing how your account managers work today.