Incorrect billing where rental agreement starting KMs and invoiced starting KMs don't match - NO FEEDBACK RECEIVED FROM AVIS AFTER ALMOST 2 Weeks

I recently rented a VW Kombi on 22 February from CPT International Airport to attend a wedding that was about 173km away. On the rental agreement number ********** 82 which I signed for on 22 February 2019 the kilometres on the odometer was 12245km for the VW T6 Kombi. I checked and confirmed this when I got in the car as well. On Invoice E ********** 82 which was sent on 1 March 2019 it suddenly states that KM Out is at 11355 and that the KM In is 12776. I now suddenly have to pay for 821km that I never used when in fact I only used 531km for the weekend. I raised several queries and still have the signed rental agreement and the subsequent invoice where i was incorrectly billed by R5221,56. The kilometres on the invoice states 1421km which would have taken me all the way back home in Pretoria. Instead I did less than my allocated ****m and should not have been charged R5221.56.

I have now sent 5 requests but none of them I got feedback within 24 hours. I only received a reply on one of my mails from two different people and both just sent me a copy of the rental agreement and the invoice. No investigation was done on my complaint because if it was I would only imagine it would not have taken almost 2 weeks to have resolved.

My biggest concern is that AVIS is not coming back. This is terrible service and they are not answering their phones (I only got hold of one person after numerous attempts).

Going forward I do not know how I would be able to trust Avis again if they can make such errors.