AVIS Hatfield Pretoria Appauling service towards black customers

I rented a car with AVIS in December 2016 via travel agent, Flight centre on unlimited kms. Upon return of the car they told me that car has exceeded service by 2000 km. They then charged me for R5400 for their lost warranty, even though I was given the car through Flight centre. They never took the problem with Flight centre but decided to take my deposit R4000 together with a charge of R5400. I tried to communicate with AVIS customer care line, but they failed to assist me. The matter was never resolved till today. Flight never told me that the car will be due for service nor did AVIS. And AVIS never told me prior to collecting the car, that i'll be liable for any warranty charges or that the car will be due for service. AVIS also never told me prior that they don't give cars to local customers on unlimited kms. All those news I heard upon return of the car. I cannot even begin to explain the rudeness and ****** of the Branch manager, she simply did not care. The customer care line the same too as they did not care about my matter. I recently heard of HelloPeter hence I am writing of this matter now.