Avis Disasterous Rental

n December I took out a rental car with AVIS, and upon return it was found out that there was a small scratch on the boot lid done by the car wash, I took responsibility of the repairs, but funny enough a week later I was sent an invoice of around R13 000.00, shocked as I was I then did a bit of investigation and background and asked for them to send me documents, it was clear that I was charged for two vehicles, only for them to get back to me and apologize and said they had mistakenly quoted me on two cars.

They then claimed that the repairs costed around R3600.00, but when I ask them for the itemized invoice from the panel beaters they run from pillar to post and can only provide the quote, what are my rights in this instance as I feel that I'm being charged for something that was not done, they have since promised to bring the itemized invoice through but it's not coming forward , the scratch was less 2mm wide. If you're expecting your refund from AVIS, apparently this is their modus-operandi.