No Notification ***** activities on account

Money is being debit from my account and I placed stop orders on my account and the company debiting my account changed the reference number and debited my account and some months twice in one month, FNB normally sends sms to ask if I know about the debit orders but that then suddenly stopped, what's the point in having a ***** department if they not doing anything to prevent ***** on accounts. I had stopped this in January and some of my money was never returned to me, no one got back to me, Then I still get charged to stop debit orders that I didn't authorise on my account. Clearly someone is doing there job's or are they involved in the *****. I want my money back and want these unauthorised debiting of my account to stop