Hathway — Unwanted renewal call

I have disconnected the hathway broadband . I have called to customer care to stop the service but daily twice i'm getting calls and messages from hathway stating that we're providing offer please do recharge. How to stop this calls? After requesting so many times to unsubscribe me from this calls and messeges, now i am fed up . I fact now I never recommend anyone to use Hathway
My a/c no is [protected]
Location: Subhash Nagar New Delhi