unauthorised debits

I am completely and utterly disgusted at the fact that I pay an expensive monthly service to keep and protect my money and yet I have debit orders that I have not authorised taking money off of my account! Every month R99 is deducted off my account and I have no debit orders! When going into fnb I was told that R99 is deducted and not R100 so that I will not receive the notification! This has been going one for months! At my own expense and hard earned money that others have access to! I requested all debit orders to be reversed immediately and to this day 6 monthsof deductions only one reversal has been done! This is my money that fnb is now accountable to pay! Quick to take my money but when issues arise the service and feedback received is disgusting! I want my money back and will be taking this further! The unautherised personthat set up the debit changes a letter or number every month therefore can't be stop so my question is fnb what are you doing about this? This can not continue and I would appreciate someone to contact me and sort this out! I refuse to go back in and call for the 50th time to get this sorted! The advisor is so quick to tell me this happens all the time???