Rental ***

I am writing this to express my frustration over Avis. I rented a car in December ant King Shaka and I was given a car with many scratches and I was told that all the scratches and damages on the car are noted. During my trip I got a stone chip to the windscreen but I had taken out insurance for that and I was told that i will only be liable for a R500 administration fee. Now Avis comes up with additional claims which were not noted upon returning the car. I am told that there is damage to the left sill of the car, damage which was noted and pictures of that were taken before I took the car at King Shaka. Why is Avis doing this. Is this a way of ****ming customers of their deposits?