FNB Closed my accounts and it cost me money, terrible customer experience

FNB informed me that they would close my account, no reason given, and despite several attempts to find out why, still do not know, I was informed that whilst FNB is closing my account, I actually had to go into a branch and close the account that I don't want to close, but that FNB wants to close. I went to a branch, was informed I cannot close the account because I have to FICA the account that FNB wants to close, not me. So...I have to FICA an account that FNB is closing... I contacted FNB FICA Department, they informed me I am indeed FICA'd on my account, nothing to outstanding, I go back to the branch, still, I cannot close my account because I must FICA my account, after hours, literally, hours spent at the branch, it transpires some other department, that noone at the branch, never mind myself can get hold of, has red flagged the account for closure, still no reason given or an opportunity to clarify my side, but it keeps popping up for outstanding FICA documents. I eventually phoned a Private Banking Consultant who after many weeks and many hours helped me, and just informed me the accounts are closed. I could still access my online banking for a period of time, but the FNB Credit Card disappeared from my online banking, including the emailed statements I usually receive, at the date FNB said they would terminate my account. I made sure on the termination date that my accounts were all on zero. Now, after many months I receive a call from FNB Credit Card that I owe them R500, on a account I did not want to close, struggled to close and have not used for months. I understand that FNB is essentially a psychopathic capitalist's corporation, absolutely have the power to close my account, but worse Customer Service ever, would not recommend FNB to any South African ever, they do not care, and not only is their customer service terrible, but the one department doesn't know what the the department is doing, what a joke, I actually had to pay to close an account I did not want to close. Close the account then FNB but my goodness make it at least an easy thing to do.