Standardbank Unresponsive

I made an international transfer from my Standard Bank Credit Card. I was told that the "wire transfer total charges" would be R372. I even have a receipt stating that this is the "total charges". After making the transfer, another R1060 was deducted from my account. I have since phoned Standardbank multiple times, I have emailed them multiple times, and every time I am told that I will be called or mailed back within 48 hours. It has been nearly 4 weeks and I still have not been contacted back by StandardBank. I am EXTREMELY disappointed with the lack of service and am strongly considering closing my accounts with them.