Tata Teleservices — Regarding not disconnecting my broadband service even after multiple intimations

Hi sir
I was using tata tele broadband services and asked for stopping my services and disconnecting it by customer care tele services and also by mail..But even after multiple attempts they are not doing it and generating next month bill inspite multiple attempts to disconnect the services..
Please help me in.
customer services by phone is giving a pre recorded voice that they can't service me.

My account no is[protected]

Pls help me