BILLED & ReFERRED FOR CANCELLED SERVICES

Somebody in that company is sleeping on the job. My first encounter with ADT after having cancelled my contract with them is their technical people calling to access my previous home to remove their so called satellite device that seems to be creating signal problems when they respond to emergencies in the vicinity of that house. Wow, any way. Now on 2017-10-12 I received a call from a dept collector from Norman Bisset saying that ADT has referred me and I needed to pay them some money. That didn't go well with me, I called ADT on the very day and was assisted by an agent called Monaka with a ref: ********** 7. He assured me that he escalated to their Pre-Legal Dept and I will receive feedback within a week. Nothing of such happened till I called them today after receiving an sms from the dept collection wanting a sum of R 4440.48. I spoke to an agent called Milicent she could not even tell me if I still have an existing account with them or not, she too promised to escalate and I will receive feedback....I doubt that. How can one cancel a service in 2016 and yet be billed, not told of none payment, be referred and yet the company cant confirm if you have an account with them or not.