Not good customer service

I rented a car from Avis Bloemfontein downtown witch took +/ - 2, 5 hours to get on 20/4/2015 til 27/4/2015 brought back 24/5/2015 hit a pothole where rim had small damage but i was charged for damage someone before me did for instance bumper and headlight of witch got nothing to do with hitting a pothole,after a lot of phone calls and time waisting of getting nowhere with Avis. On 14/5/2015 i got in a car and drove to the nearest Avis branch in CENTURION from where i was visiting. A very sweet lady by name of NICOL DU RANDT assisted me EXCELLENT SERVICE, Bloemfontein were proofed that we knew about the bumper and they did at walk all round inspection nobody saw any damage on light that was also damaged. OTHERWISE with AVIS Isando Head Office spoke with Chan-E on 21/5/2015 who would get back to me in 40 min I AM STILL WAITING I have made a few calls again as one time phone desk told me Chan-E is in a meeting and she do not take messages .Now what am i to do to get this solved. Maybe i must come and train your staff to do the job right. LACK of TRAINING?AVIS MOTTO?WE TRY HARDER.?REALLY ?? Take some PRIDE in YOUR WORK .!!Ma be Twitter Face book Whats app will