I rented the commercial car from Payless rental.Unfortunately we got an accident(we hit a dear). Regarding Insurance, I paid for all except CDW(calim damage waiver)since I used American express to pay the rent and American express is supposed to cover the insurance. American express paid the amount claimed by the car rental company.However some of the expenses like administrative expenses and loss of use haven't paid yet, since car rental company didn't provide the supporting documents for that though American express is willing to pay that in the presents of doccuments. when I talked to car rental company they said they are not able to provide those documents due to their company policy. Now they have sent this case to collection agency and I got call from them.They threated me to take a legal action. In this case,How I would be able to take care this?.P.S.-American express is still ready to pay for this, if they provide supporting documents.