Reliance Communications — bills being issued for out of service phone connection

I had a rcom wireless landline number ([protected]) which stopped working in nov'17. But still i am getting bills against this number. I have sent several emails to their custmer care but no reply. I tried to call them but it seems that their number is also disconnected. I want these bills to be withdrawn immediately and i want the amount that was lying credit in my account as on the date of discontinuation of service to be refunded to me. Also i need the amount that i paid for their landline instrument to be refunded back to me.