close account

i closed my account in January at fnb, and they did not process it, and then i wrote an email which they did call n confirmed that they will close it, on the later stage someone called again saying that i have to come to the bank and point out the person who closed my account. instead of freezing my acount and doing their investigation my account is still active and its in arreas due to their own mistake, now they sending emails that they would hand in my account to credit barriers. i even wrote an email again even went as far as sending them a message to their face book but still they did not respond.