Cancel the monthly service within 30 days and I refund the monthly minimum, every dollar of it. The setup deposit covers build work and isn’t refundable once I start, and neither are the fees on jobs it has already booked you.
That is narrower than it sounds. Booking fees are billed against the monthly minimum, not on top of it — so if it booked you nothing, the fees were nothing, the minimum was everything the service charged you that month, and all of it comes back. If it did book you jobs, then it worked, and you are keeping those.
That is the whole guarantee, and it is written the same way in the agreement you would sign. I would rather put the awkward half of it on the page than have you find it later.
And separately from any of that, at any point: cancel with 30 days’ notice, the forwarding comes off your phone, and your line goes back to exactly what it did before.