What they are paying is right on their order form.  Being nationwide (and busy) there is bound to be misinformation in their spreadsheets.  If we've had to raise a price somewhere, or it's just plain wrong, we merely write back and say "Doc Ret fee in this county is $X.  OK to proceed at that price?" and/or "copies are now $1.25 in that county.  Ok to proceed?"  They write back and confirm acceptance.  We keep all e-mails so it's easy to double check, but really, we've never had an issue when that occurs.  They approve the price and pay accordingly.

*I* don't pay off of invoices from the abstractors either.  All of my data is part of my program, including fees that are updated when we get a "new pricing" from an abstractor.  The abstractor then has the opportunity to dispute when we send out our statement to them just prior to payment.  We will look at the invoice as it comes in with the order and make sure we're on the same page.  If Doc Hunters isn't doing that, they should.  It's much easier to fix problems at THAT stage, than later on down the road.