Very Bad and unacceptable service from AVIS

I hired a car at service during the course of July 2015 - I hired a Audi A3 Sedan (Blue) - I drove the car down to Durban for a holiday - Before taking off the car to be driven i kindly asked the consultant that \i notice that the tyres on car are not the same why? i was told to rest assured all will is fine.<br> <br> Drove the car down to kzn - on my last day i was involved in an accident the car was a write off because the back tyre (passenger) came off. Prior to paying R4000 to hire the car i was told i had to pay R3500 for access which i did....drove back to joburg and i was told i owe more money because of the kilometers i used which i adhered to and made arrangement with. Avis never debited my account as per the arrangement which was R1800 then later on i get a call from Olebogeng saying i owe about R3400 or something i refused to pay something i don't know off - Then i get a call again today saying i owe R11000 for what he can't answer me.<br> <br> This is a bad service and i won't stand this as the amount keeps on changing every second - If avis can't hire people that did proper maths then they should consider closing down their business cause clearly its useless and unprofessional."