Dishonest service providers

I'm so disappointed with avis. I took a courtesy car on the 14th June, it has scratches all over I showed the attendant as we were doing the check list he ticked those spots where I showed him, on the day of me returning the car they said I'm responsible for those scratches told them they were ticked on the check list to my surprise they said they were ticking for dents and not scratches and I'm going to have to pay for those scratches I asked the to give me five previous checklists on the car since they are saying I scratched the car they haven't been able to do so. I mean if they are so convinced I scratched the car the least they can do is be transparent with me by providing the history of the car. I'm disappointed at avis because its clear they make their profit by reaping people off. Iv been sent from pillar to post no one has assisted me. Think twice before you take out a car rental.