Disinterest in assisting with ********** transact

I have a Gold cheque account with FNB. On 01 Dec 2015 an amount of R16800 was deducted from my account with reference FNB CARD ***E89397. When I called them to investigate who debited my account last night I was told about a Kulula credit card.This Kulula credit card was handed over to the debt collectors (Barret and Associates) in 2010 which I have been paying since then. To my suprise fnb kulula credit card directly debited my account yesterday.When I called the kulula credit card they confirmed that they had handed me over but are unable to explain why I was debited.I went and raised this with my FNB branch in PTA woodlands and they are refusing to reverse this transaction even after telling them that I do not know of such arrangements.I would have never agreed to an arrangement of paying an amount that is almost my salary. Between FNB cheque account consultants and fnb kulula credit card, I am being tossed around like a ball,I am unable to get any answers or any assistance.I am failing to understand how when a credit has been handed over to lawyers which you are paying can still be debited with a ridiculous installment from my account.If my bank cant help who will??