Avis' disgusting customer service

I have been renting a car through Avis for almost 6 months now. The contract stipulated that I would be paying R5880 monthly. Each and every single month Avis will debit R9800 over and above the R5880 which is almost triple the amount they are meant to take. <br> <br> I was first advised that this was due to the fact that I am using a cheque card and was told not to worry because it will be refunded shortly afterwards.Every month they do not refund the money unless I run after them to do so. It is always a mission and always takes weeks to rectify. All this requires is the sending of one simple e mail from Avis to the bank to request that my money be released. They always delay in doing this for me and as a result my credit rating is being seriously damaged. I am in the process of trying to purchase a car but because of the bad rating due solely to Avis messing me around, I am being prevented from doing so. <br> <br> This has happened yet again. I phoned on Thursday morning and spoke to Sugendra Naidoo who promised faithfully to get back to me. Its now Sunday and still have not received a call and the problem once again has not been rectified. Stuck in Cape Town with no money, BESIDES MYSELF.ANGRY