Funds taken off my credit card because of Avis's faulty car.

We received a car from AVIS which had a faulty petrol cap which we were unaware of and even the agent from AVIS checked it once it had to filled up. My husband brought it to their attention that he would have filled it with his company petrol card but could not because the cap could not open. They gave him another car and we had to pay R 826.88 for the faulty car to be filled but this was their error. I feel we should be refunded and I am very disappointed. If we could we would have filled it but now we must pay for it because of Avis's mistake. Is this how you treat all your customers. Voucher No. V***7