AVIS tries to rob me again.

I had to send my car in for repairs, and my insurance rented a vehicle for me during this time from AVIS Randburg which was the closest branch. I called on the day of returning the vehicle and asked if it could be collected from the repairer down the road, to which they agreed as is common practice I am told. I proceeded to refuel the car and left it at the repairer. About 2 hours later, I received a call from the branch stating that there was damage to the front bumper which i refuted. I was then sent pictures of the damage, which I recalled was present before I took the car initially and was marked on the pre-rental car inspection. I asked for this to be verified and have not been advised further. Today i see a R1400 charge to my credit card and when i called through to query, i am told, its for damage to the car. Nobody called me, nobody sent me an invoice, and nobody confirmed that the damage was actually there before I took the car. But AVIS was quick to close the account and charge my credit card.