Once we were charged for someone else's laundry bill and that was removed immediately.  Another time we were charged when the laundry service was a perk for us. We wer told that they put on the charge and later take it off and that is what happened.   Still another time, we had a voucher for a dinner for two in a specialty restaurant.  The voucher was not submitted by the specialty restaurant and the charge stayed on the bill for several days.  It eventually was removed but we had to go to the specialty restaurant to inquire about the lost voucher.  Luckily we had a photo of us taken at the table with the voucher sitting right there.  The moral  here is to be sure to check your statement regularly not just on the last night.  It may be too late then to have incorrect charges removed.