Unauthorised NAEDO debit orders by Telkom

For probably more than ONE YEAR now, Telkom has been deducting unauthorized debit orders from my FNB account and every month I have to instruct the bank to reverse these deductions. I have been to Telkom stores, I have tried the call centers. Every time Telkom tells me they can see that the money is going off from my account but they don't know why ... they can also see that I haven't had a Telkom account/product since 2017! Why and how is it that they get away with it? And why does it happen to so many people but neither the banks nor Telkom can (or wants to?) do anything about it?