Credit card *****

<p>I have a credit card and a cheque account with FNB and I selected the debit order option from my cheque account to pay off my credit card and these payments have been debitting fine up until the beginning of this year and started getting messaging advising I owed them money. Who authorized the manual payment without my signature or does that mean they accessed my account internally and made changes themselves of which I have to pay extra fees for? As is the case with manual payment/ transfers? What else are they doing with my account I wonder???? I have phones them and was promised a call back, a week has gone by without anything, I lodged a complaint on their mobile app and sent emails too but I get no answers at all.....whose fault is it? Who must be penalized for something that is not their fault....ME?</p>