Refuses to close FNB Account

I have been trying to close my business account with FNB since 10 September. I had to transfer the remaining balance out in order to close then, it took them so long they they billed me for another months bank fees and then they said they couldn't close it because I owed them bank fees. Then they reversed it and we waited again for them to close, then there was another charge on the account that I had to pay for before they would close it so I paid, account back to Zero balance, still waiting, now they tell me I have to pay a closing fee before they will close it. This is RIDICULOUS! I want to close the account due to the business closing down and they won't let me close it with all these excuses and extra charges. They tell me to make it a zero balance before they can close it, then they put charges on and then tell me they can't close due to amount owing. I'm at my wits end with FNB, NEVER OPEN A FNB ACCOUNT.