Avis Debited my card R3051.46 instead of R1016.91

I rented Avis car on the 27 August to 1 September 2015. The rental fee was R1016.91 + toll fee. Fuel was full when returning the car, and it was confirmed full.<br> The trouble started when Avis alleged there are 3 missing wheel caps on 3 wheel. I explained to Avis that when I collected the car was at night and couldn't verify whether or not there were wheel caps, neither nor the person who handed the car and perform the inspection. We inspected the car using my cellphone flash light and only focus on the body work.<br> On returning the car, Avis alleged that it had wheel caps however, they couldn't for certain verify that it was indeed true. They promised to investigate and get back to me with their findings and will make a quote. <br> Since then, no one gave me a feedback of the investigation, no quote for the rims, no invoice. No one from avis I saw a transaction worth R3041.46 from my account to Avis. I feel violated and abusing their power over my account to decide to Charge me for the wheel caps without giving me the report, quote for the replacement (if I am at fault, can they prove it). Is it a matter of big boy vs small man.<br> Is this ethical? Did they prove I took the car with caps?