Avis Car Hire - Disgusting Service

Absolutely shocking customer experience with Avis at the Cape Town Airport. When I got the car there was noone to do the handover and point out the various defects on the car - of which there were many. On returning the car the Avis consultant pointed out 2 defect (a crack in boot cover which I had noticed on first getting into car) and a cracked plastic hub cap - which I hadn't noticed, but 100% disputed was done by me. The Avis consultant asked me to fill in a dispute form and sign, which I did. However a week later my credit card was charged >R6k and deposit taken. When I enquired with customer care, they basically said tough luck and they will not be reversing the charge. Now I must pay for someone else's damage- it is completely unfair and poor service. I have only ever used AVIS and will now tell everyone I know never to use them again as this sort of treatment is not acceptable. My issue is not resolved and my repeated emails go unanswered.