Ongoing debits of monies from credit card

I rented a car early June 2015 from South Africa, for a car to use in UK. Since my return I have had 2 credit card deductions from my account for the amount of Rands R726 on the 27th July 2015 and similar amount 8th September 2015. <br> <br> I sent to Europ car uk my credit statement which they seem to refuse to open, but instead have rep**** to me 3 times stating they have NOT deducted any monies and that I DO NOT owe them monies. However, I have sent them the statement which proves monies went off. Why they don't open my statement I don't know. <br> <br> My major concern is that Europcar is claiming that they are not deducting monies, yet evidence proves otherwise, which means someone is debiting my card on behalf of your organisations without yours or my authorisation. I have had to block my card and may need to pay to replace it. This is all due to poor service by Europ car. I am becoming more and more reluctant to use your service <br> <br> Auto Europe voucher number ZA78012-1