FNB bad service

I received a call from unknown company confirming to me that my fist debit order will go of this month. I have not app**** for anything and I told the person and they confirmed my details. I then called FNB ***** and advised. They suggested I change my account number just prevent ***** happening on my account. I went to the branch and explained the situation and the consultant advised that I can't close my account cause it's flagged under Debt Review. I should call Debt Review. I called FNB debt review and they are saying there is nothing that they can do. So I ask myself what I should do. Should I just let ***** happen on my account? Cause I feel like I was treated more like a ******** then a client.