car was shabby, scratches all over. not clean. I was charged for a scratch that was there before

please have picture of the car ready showing all damaged (and not damaged) places at the time of rental. The underage boy who was checking the car wasn't taking pictures at the time or rental, only scrapping some marks on printed paper which then was presented as a proof, although both sides were marked I was said that one of the scratches was new. I didn't have time or energy to argue, but I'm not going to use your agency or recommend it to anyone to use it.