Please Help Me Close My Account!

I had a revolving loan with FNB which I have settled last month. Firstly, I called the bank to ask for a settlement quote and was told that someone would return my call and still nobody has called. I then just settled the account with the settlement balance reflected on my internet banking profile. I then called the bank again to close my now settled account and a debit order went off again!!! I called them again last week and was told a supervisor would contact me and again nobody has called me and this damn account is still open! I waited a whole hour on the line for a supervisor to get to the telephone and eventually hung up. What is up with this bank???? I feel like moving my salary and home loan to a different bank because I’m tired of dealing with *********** people. Can someone please just close or confirm closure of my revolving loan account PLEASE!!!!