Standard Bank ......... Any excuse right !!!!!!

Multiple and duplicate purchases were made on my credit card that exceeded my approved limit in one instance, in one day to the amount of R17189 , of which the bank authorised, WITHOUT my knowledge . All of these were recurring purchases , NO notifications from the bank asking you if you are buying and you approve?? Feedback from the consultants or investigation team is that " the client is in good standing with the bank so the purchases were approved" - So does this mean that anything can happen without your approval? GOODNESS ME Standard Bank, Please take some lessons from other banks who give you notification when duplicate purchases are made, even as little as R15!!!! WORSE these transactions were above my credit limit that I had approved/requested, since when is there an overdraft on a credit card facility ? Doesn't one apply for a limit increase ?? Why am I liable to pay for purchases that I did not make above a limit that I did not request ?