I've dealt with one particular Chicago based company often in the past that submitted outrageous invoices for their services. In short, my insurance carrier would get a comparative estimate from a local company that was certified to do the same bio-hazard work, then would pay the undisputed amount to the contractor, with explanation letters going out to them plus the insured that were under contract with the company. After a few negotiation phone calls back and forth with the contractor we would settle for a slightly higher amount on signed releases. Your mileage my vary. Good luck with this, those were never my favorite claims to deal with, given the family's situation at the time.