ADT: Cancellation Nightmares

I signed a contract with ADT for 12 months from 15/05/2018 until 15/05/2019. All debit orders as well as the radio fee was paid for the 12 month contract. Notice was given ONE month before the end of the contract as per the Service agreement. It's been a year and a half since and ADT is still debiting my account without authorization from myself, and the bank has been unable to stop their debit orders. I managed to reverse their debit orders for over a year and a half, which had cost me a fee with my bank. This month though they have decided to blacklist me and hand my account over as well as decided to debit R6000 WITHOUT any authorisation as the contract came to an end on 15/05/2019 which was the last debit legally done by ADT. I am at my wits end with this company and will NEVER recommend them to anyone. I have also informed my local newspaper as well as on social media regarding the frustration I am going through with ADT. I have reached the point now where I have asked my lawyers to get involved and ensure that ADT cancels the contract as well as reimburses my bank charges for the year and a half which I had to pay due to their incompetence. I would NEVER advise anyone to use ADT, rather use a smaller local security company as ADT does not care about their customers. Hopefully my lawyers will be able to get a favourable result as I am at my wits end with this company.