From the prompt  to express to your claim adjuster this was not prior damage and the marks was not on your car before. You want to let Sam know this issue will need to be fixed or you will seek an attorney because this is unacceptable.

 "At this time, the damage sustained to your front bumper and rear bumper are unfounded as part of the incident involving our insured. An investigation was conducted using various resources, personnel and it was determined to be existing prior damage."