Reliance Communications — not disconnecting

Address:

Pune, Maharashtra, 411057

[protected] is my reliance broadband id. I got the connection disconnected 4 months ago. I got a mail that my billing will be stopped. This happened. But after that they are not collecting instrument and settling the final bill. Now, not sure how long do i have to wait and hold on to the instruments. Even after multiple requests and mails, i just get assurances and no action.