Are you sure this won’t show up somewhere in your credit report? I’d be very leery of a “write off”. I had a simular experience where I got a bill for a piece of equipment that was supposed to be taken care of by the insurance company. I inquired as to why it kept showing up on my report after the medical problem was long over. There was nothing in the paper work that indicated that this piece of equipment was rented and they were still billing for a rental. We finally got it taken care of but you need to check to be sure it is not “written off” against your credit.