Pathetic service and complete *******, Avis East London branch is BAD

On the 24th I went to East London, Avis and rented a car for the weekend. When I collected the car, there was no inspection that was done with me, I was handed the keys I after I completed the paperwork and I was gone. I returned the car on Sunday, as I came in, a guy told me to sign a document without explaining what I was signing and to my understanding, this was a normal process when returning a car. As I am at home waiting for my deposit to be paid back to me, I got another R4k amount deducted to my credit card. No communication, no call or email to explain why. I called this morning 1st Dec to understand, I am advised of damage that I was not aware off, the car was perfectly fine in the same condition I got it. No inspections were done and this “damage” apparently is under the vehicle. Unfortunately I cannot accept this, this is unacceptable and total *******. I want my money back, even the guy I spoke to from East london branch couldn’t explain this to me. Rental agreement number ***