AVIS PATHETIC!!!!!!!!

During April, my car had to go in for repairs and I rented a car at AVIS. I picked up a car at Avis Vereeniging - firstly their systems were off-line, so it made paperwork a nightmare and secondly, got to the car and it would not start. Eventually got another car! When I returned it, they asked me to have the car washed first before returning it otherwise they would charge me R300 - Never have I ever had to do this at another car rental business!! Then I got a SMS 2 months later saying that I had a final warning to pay an outstanding amount. AVIS had my credit card details, why was the correct amount not deducted? AVIS's terrible admin is not my problem!!!! No one from AVIS even tried contacting me to notify me of an outstanding amount!! I phoned the AVIS branch and requested that they send me a detailed invoice of what the outstanding amount was for, so that I can make the payment - I'm still waiting 3 weeks later! (I phoned 3 times, once they picked up and twice didn't even answer their phones, pathetic!) I phoned AVIS head office, who sent me a statement, but said that AVIS Vereeniging will contact me and arrange for payment since the amount had to come off the same credit card. Two weeks later - I'm still waiting!!!! Now it's reflecting badly on my credit rating!!!!! Will never recommend using AVIS to anyone! Seriously PATHETIC!