No safety for my money

Currently on hold for a supervisor... going on 20 mins on hold now. An un-authorised debit went off my current account on Friday. After 3 useless calls to Nedbank I downloaded the money app and reversed it and put a stop order - which I have been charged R25 for. I am paying for the *****. I called in again and asked why I was charged etc. I was then told I can stop the debit but they can just change the reference and do it again. So I ask what else can I do to stop this happening? Nothing she tells me. I can do nothing to stop ***** SAYS MY BANK. Wonderful i spoke to Angel (25 mins on hold) the supervisor in the service department and she is tracing the ***** debit order and will contact me before end of today. If this account has another ***** debit order, I will be cancelling my credit card, investment and current account with Nedbank. This is not the first time I have had ***** on my cards and accounts and you certainly charge enough for me to expect my money is SAFE , which apparently its not