Tata Teleservices (Punjab) — Disconnection of mobile

dear sir/ madam
i am using tata indicom No. [protected].this No. had been disconnected from 11 april and did not started even after paying 150 % of my billing amount. each time after calling custemet care they give me new reason and additional deposit to start my phone. finally it starts on 18 april but i sufffered a lot and decided to file a case against them. tell me the way how should i proceed for it. i also given a letter to there regional office but they yet not replied it even after 10 days.
please guide me to file a case against them in consumer forum
Regards
Amit Mishra
H. No. 3503,
Sec. -40 D
chandigarh
Permanent Add. & add for Comm.)
C - 37,
New Nakoda colony,
baran ( Raj.)-325205
Mob. [protected]