Hathway — unnecessary calls

Address:

Mumbai City, Maharashtra

I was having a broadband service from hathway in mumbai. Since i have shifted to kolkata, i had disconnected the connection. It's been two months now, i am receiving multiple calls from their service center (Sometime 4 calls daily), why i have diconnected and other stupid questions. Even to my surprise, they don't have detail of my previous discussion and from last 2 months i am entertaining their queries. I have blocked their number on my cell, but they have multiple contact numbers to call me. Pls do something to stop these calls. It is my right to take or not to take any service. Usually i am getting calls from number[protected].