AFRICAN BANK *******

So this bank decides to ignore the NCA and without communicating with me, credited my account and did an interest fee thingy on my credit card. I am paying my debt without missing any payment, then suddenly my credit card account has a - R6000 balance. I never had a negative balance before, when I ask what's going on, I am told by the same bank that they are sorry, it's their mistake. However, they still want me to pay for their mistakes. Why should I pay? I escalated the matter, I got a feedback from a certain Kabelo via email. Nowhere do they acknowledge their gross incompetence and insist I should pay. I have written to the bank Ombudsman and am busy printing some merchandise that I will be sharing on social media about how ************ this so called bank is. I am in the process of trying to bring this matter to their Group CEO. I am not going to let them get away with this