STANDARD BANK COULDNT CARE LESS!!!

I have a blue bean credit card which is in arrears because I am in a financial crisis at the moment.On Saturday they just decided to transfer R881 from my cheque acc to the blue bean without my permission or even doing an affordability check.I called them and asked them to reverse that transaction because i would make an arrangement to pay a lesser amount but they refused.I've also spoken to someone from all the different departments requesting to speak to a superior to plead my case to and they also refused to refer me to a manager .What can I do because I've been told that they can take whichever amount they like without my permission and regardless of my situation.