FNB unable to close my account

Hello I have been trying for the past 6 months to close an account with this bank with no sucess at all. The account had been previously handed over and i have paid in full the outstanding amounts, and instead of the account being closed, they started billing me for services that i had no access to. i was made to pay R113 in order to close the account in July, which i did. and when i went in 7 days later to follow up, as the account still appeared under my profile, they gave me stories that the account was locked. Month after month i have been going in to the branch and all the time i had been receiving different reasons from 1.The account being locked, 2. to the account being linked to another account 3. or totaly new reasons all together. Please can you help me close my account as it is reflrcting as a liabilty under my name