STOP DEBIT ORDER SYSTEM NOT WORKING

I have attempted to stop unwanted debit orders on my account. I visited my branch where they showed me how to stop debit orders using my cellphone banking and to stop them by a monetary range. The debit orders keep coming through and I am now losing an average of R500 per month to unnecessary banking fees which the bank will not refund. I have sent cancellation notices to the companies but still debit orders are processed. I need my total bank fees refunded or I will have to change banks.