Unauthorized debit order

Nedbank debited a lump sum of money on my account without my consent. First time i did not take it seriously because it was not a lot of money and this comes after i have called in being transferred to different departments in trying to find out why the money was debited. I eventually dropped the call because no one seemed to help instead i was treated like a passing ball. A couple of hours ago another debit order when through, again i called in and AGAIN i was transferred to all sorts of departments which failed to help me. Not a single line in the contract that i signed with nedbank 6 years ago say anything about debiting even a cent on my account without my consent. From this day forward, i will cut every single card i have with nedbank and stick to the capitec bank i have. Clearly nedbank does not care about customer relationship. #disgusted