DEBIT ORDER REVERSAL

I have a debit order going off my account on a monthly basis with this ref number Talarabian I have called FNB customer service endlessly to ask them to stop and reverse this debit order only to be told that there is nothing they do to stop this debit order , I have tried to stop and reverse the debit order online without any luck as they have advised because is less than R200.00 I haven't authorized this company to debit my account why is FNB allowing these companies to debit our accounts for them to tell us that there is nothing they do. i get debited R119.00 monthly which is a lot of money this has been going for 4+ months. the FNB call center service is atrocious i would not recommenced FNB to any of my friends or family i have already told my sisters to close their FNB accounts to avoid unknown debit orders that FNB can't reserve .m defiantly closing my account.