Premiums deducted in error for over 7 years with no resolution

It's a long story but basically our account has been debited for 8 years by ADT for an alarm system we do not have. We have had a National (originally Chubb) alarm since January 2014. Over the years we have tried countless times (telephonically, email, web forms, etc.) to try and have debit cancelled and monies deducted in error refunded. It has been a nightmare and in the meantime over R40k has been deducted off our account over the years. Now we have been referred to our area manager, Warren Cerff, despite phoning, sending email and Whatsapp messages also still no response. Guy before him, Nicolas Govender and before him Vincent? didn't bother to make good on commitments to resolve either, neither has another new manager Johan (de Lange I think?) bothered to call back after taking down details and committing to resolve urgently either. We have even tried to cancel the debit order on our side with the bank and voila, next month another debit from ADT? Do not meet with ADT for your security needs, do not try to get them into your neighbourhood with all kinds of promises of cameras that track people via facial recognition, number plates, etc. We've never had an issue with Chubb / National, even when I was retrenched they were happy to reduce our premium to pensioner tariffs until we were able to pay full fees again - now that's great service that will ensure customer loyalty.