Accounts paid up. being firced to keep it open

I have an FNB gold cheque account. I have setttked all out standing balances. Including the Fnb device. When trying to close the account to save on bank fees I am told its not allowed because of the Fnb device that is paid in full. FNB has forced me to move to another bank due to over charging on accounts. I hate this Bank. I hate everything you stand for you are forcing clients to pay over Thor heads for unwanted acciunts. This is utter bull **** and I hope your servers explode.