Deduction of unauthorised money

. I was on administration from 2001- 2015, FNB was one of the creditors on administration. . On 3rd August 2017 FNB deducted unauthorised money from my account R435.00, of which I called and they reversed it, their servive very poor and people rude. They were harassing me. . I get calls from FNB legal staff that I am owing them. I did sent the certificate many times that I am not owing as I made a settlement, and.provided with proof of settlement of all my creditors as they were one of this creditors. . On the 2nd October 2017 FNB Deducted unauthorised amount of ,R327,82. From monday the 2nd was on the phone holding for ageless hours, bad service, on the 3rd also called FNB ti reverse the EFT they made towards my account, on the 4th I weni to the Atteridgelle branch for help, starting from scratch sending my call to legal, explaining my matter to them ehich landed on deaf ears. . Why do I have to be treated like this? Is it a ******** offence to be on administration? Please help, as I want to take my accounts from FNB to the other bank. Im having a bond, a saving and investment accounts that I need to move out ASAP.