[_jal]

Yeah, they play this game enough that I simply question fucking everything. They will explain every single line item in a way that I can map back to a timeline, or they will take it off.

This has to be done in person, where they can't be, uh, accidentally disconnected, but I've found the rate-of-return on that time hard to beat. They discover all sorts of "mistakes" when you're taking up their billing specialists' time.

It is a bit like haggling over your car price after you already bought it; the main thing to get over is the social discomfort of being a pain in the ass, so they can't use that against you.