Bad service

last year December i booked a car at avis which is something i regularlly do, then when i returned the car it was a public holday but luckly they had a safety deposit box at avis vereeniging. I left the car then few days i realised that my invoice wasnt processed yet,then i called to ask why then i was told that the car had a scratch on the right vender about 2centimetres. which i had no idea off then cause i always book cars with avis i didnt not dispute the scratch cause i did not see the scratch and i was not there when they checked the car. to my suprise i recieved an sms saying they going to bill me R2200.00 for that scratch, then i called to querry about the amount charched for that scratch. the agent i was talking to by that particular time said she will send an email to her boss then let me know whats the solution. she indeed sent an email and copied me on the email but since then no response had ever came to me. from the 8th Jan i called every day asking what was the status but i was promised a feedback which till today i am still awaiting. i even sent the consultant an email but she never responded. to my suprise i was billed R3200.00 but the sms said i was going to be billed R2200.00. i always thought avis was caring for its clients but i am very disapointed with the experience i had with this particular incident. and till today i have not yet receieved my invoice from avis to know what the money i was charged is for what. cause normally after the rental they email an invoice but i am still awaiting the invoice of Dec 2017! but the money they took from my account. and whats makes me angry is they said they were going to send me photos of the scratch but i have never recieved any photo cause i dont even know the scratch nor have seen it.