Abusing clients' deposit or just sloppy?

Rented a car, was not given the opportunity to review for damage, was given the thumbs up when I dropped it off (after the attendant had checked it out) then received notice of a windscreen chip at R9K bill! I know this didn't happen while I was driving. I would have heard it. Immediately notified Woodford and received no reply. Just a bill the next day. Again I rep**** repeating my earlier mail. Again I was ignored. I have taken this up with my bank and the Consumer Ombudsman