Unauthorised Charges to my Credit Card

Arrived at the Woodford Cape Town to find that having booked an automatic (at a much higher price than a manual) we were given a manual. Addressed this with Clint at the desk who said an automatic would be coming back to the shop at 17.00 that evening and that he would have it delivered to our villa by 19.00. We waited in the villa all evening and no car arrived. I rang them the next day and they had no clue as to what I was talking about but promised me a car later that day. They had my phone number and email so that they could contact me to arrange a drop off time. Again, I never heard another thing and contacted them to be told that they had rung my hotel and had been told there was nobody in my room. This was an outright lie as I wasn't staying in a hotel and the villa I was staying in didn't have a phone. I was told I would have to call again in the morning (at great cost due to international phone charges). I rang them again the following morning and was told a car would be delivered that afternoon, which it was. Having returned the car, I got home to find that they had charged an additional R5000 to my card and now cannot get a reply to emails. When I call, I'm told to email