Very poor customer service

I have been a client of ADT for a few years now, more for the cameras that was supposed to be installed in the neighborhood, that never materialized, and a panic button. Last year January I sent an email requesting that my contract be stopped, I have a month to month contract. I realised only in January this year that it was never done and they are still debiting my account monthly. I sent another email and struggled to get any feedback. My bank account has been hacked, and I needed to open another account. I explained all this in my email. Regardless they still debited the amount every month from an unfunded account, thus incurring non funded penalties from my bank and a poor reflection on my credit score. The phone numbers cut off as soon as it starts ringing and emails are not being answered. At long last I got hold of someone in accounts and he gave me the banking details to pay the banking details to pay the "arrears" as well as the month notice in advance. He assured me that he will cancel the debit order and get me a payed up letter. No payed up letter, and they again ran the debit order in the unfunded account!!! Again extremely difficult to get through on the phone, no answers to email!