FNB doesn't do their work with no help

I'm nearly my whole life a customer of fnb. Lately I was ****med and fnb couldn't help me. Then the last 2 months debitorder go through where I have no idea where it come from I tried for 2 days different numbers to reverse this debit orders and stopped it and cost me money. I mailed so many times just with a ref no with no response. Well my bank is in a negative state with all this debit orders and fnb is nowhere to help. I don't know the longer you with a bank the less they care