Consistent ********** debit orders

I have been struggling with FNB with unauthorized debit orders for most of this year. These ********** debit orders take place every second to third day. I have been on the phone for the last hour being sent from one department to another. Nobody seems to have simple answers for me. These queries are at my cost. The problem is getting worse as debit orders are going off in an account that is not registered with any credit provider and I am being charged for debit orders bouncing even though they are **********. Both the accounts and ***** department cannot assist-they just transfer you. I am ready to close all my FNB account once all these queries are resolved. I pay monthly bank fees and yet I must guard my account daily for ***** and FNB still charges me so either way they make money.