ACCOUNT CANCELATION

Hi i have been with Fnb for sometime now and my initial account was a savings account by which i was called for upgrade on my account which was done telephonically and a card sent to my work place, than i had a problem of unauthorised debit orders going through my account and making my account to be in arrears if the debit goes when my account is at zero by which i was withdrawing all my money to ensure no unauthorise person take my money since with me stopping and reversing funds did not help. I finally i decided to cancel and close my FNB account and since i am on private banking i wrote a message through FNB Private banking to inform them about my decision and that i want account closed,he said he couldnt do that when account is in arrears, i than rervesed one of debit orders that went through so that account can be closed, he than said to me he will speak to his manager regarding the closer of my account and will come back to me, since than in June 2015 i am still waiting for him however i am currently receiving calls that my account is in arrears and further steps will be taken if i dont pay FNB those arrears were made by debits that were unsuccessful as i changed a bank now.