Tata Teleservices — Paying bills but No Service

I have been paying a bill of 532 Rs. every month for my landline numbers under account no.[protected] with Tata Tele Broadband. My phones have been disconnected and unoperational for past 2 months. Tata has been regularly asking me to pay the bills but even after making multiple complaints over 3 months, they have not bothered to respond and look into the matter. I have also sent a mail stating that I wont be paying bills for service that hasnt even been provided. I want a refund for past two months and urgent repair and reconnection service.