[Resolved]  Hathway Cable & Datacom — too many unsolicited phone calls

I had once done a mistake of buying hathway cable for a month. My account number is [protected]. Due to their pathetic customer support, i discontinued the services. Since then, they are calling me like 6-7 times in a single day. This is a clear case of harassment. I have contacted their customer support for dnd activation. They have assured me several times that they had enabled dnd and i won't receive any calls from them but they were again calling me the very next day. Till now i haven't received any satisfactory response regarding my dnd request.