Lack of service

I was debited 8 different amounts for the past 2 months. I reported the problem to FNB. I was advised the institution that debited me has locked my account and the debit cannot be stopped. I find it inconceivable that my own bank cannot stop and reverse these unauthorized debit orders. If my unauthorized debits are not reversed and stopped I will definitely be closing my FNB account and moving to a bank that is actually helpfull. It is my money after all.