Unauthorized debit order

South African Payment Exchange debited my account without my authorization, the bank could only assist me by giving me the company's number, (012) ********** , I called and as soon as the lady heard what my call was about she dropped the call. I have been since calling back and there is no answer! Are South African banks not equipped with dealing with ********** companies that use their system or are they just happy to benefit from the fee of reversing the transactions?