Poor Service

On the 11 Jan , I had arrived in Capetown an was need of a car hire.My friend referred me to Dollar Thrifty at Capetown Airport I hired a car from the 11Jan to the 18 Jan.I returned the car on the 18 Jan with the full tank of fuel as agreed on signing on the t & c .When i asked the guy checking the car in if everything was okay he said it perfect and i used the car within the req km and i would be refunded my dep .When i got back home i received by dep returned not only that after a few days I tried using My credit card and i found they had taken money out again without even informing me.I have right to know if they going take out money from my account.This to me is ********* business practise .If you are going take money from a clients account the least you could do is inform the client prior to taking the money out and besides the client needs to know but this was not the case .I Tried calling them about 10 times and was promised feedback nothing was done all i was told they don't need to inform me and they will call me back but nothing happen.This to me is ********* business practise.I would never recommend anyone that does things in a unfair business practise. Extremley disapp