Pathetic company with *********** staff.

Supersonic has the most incompetence call centre people in the world. I am NOT signed up by them but they are my ISP. Miracles happens. For 60 days this battle goes on. I cancelled a contract that does not exists. NOW They refuse to release my line. I don't owe them money because i am not their client. Even this misteriously happend. They always escalates or investigates or a superviser will call back in a turn around time of 48 hours. Needless to say nothing comes from this. Can someone please tell me how to get out of this ridiculous situation. Gets transferred from one department to another and none of them can assist. They sounds like robots. If they dont have the script in front of them they can't answer. I cant get any answer or remotely decent service out of this pathetic people.