Hathway broadband and internet delhi - Metal toortire past more then 6 months

I took hathway internet service for * months but i dont like there charges and speedof internet. So i decided to remove it and i didnot pay the amount for next. And asked company multiple times that i dont need your services any more. But from last six month and more im continously getting the call from different numbers even though i blocked multiple numbers but still imgetting their calls. In day time wheniwas sleeping or when imin some kind of meeting im getting there calls due to this i have geting health issue particularly of metal health issue. I told them about complaing to consumer court still they are harrasing me.. im cursing that day when i give my number to them. Please help me to resolve this. And try to take stringentaction over them.