victim of MTNL luring offer for cheap broadband

i am a victim of MTNL luring offer for cheap broadband.i opted for MTNL broadband connection in THANE region. my bills for
last two months areexcessively high(approx.Rs4000/- Pm)inspite of limited use. there is no security and i suspect that my
line is tampered and also used by other party. i tried to change my password (given by MTNL)as guided on MTNL web site, it
was not permitted and repeated attempts failed. i lodged 2 complaints with MTNL but no response from them. now i have
decided to discontinue the triband from MTNL. THerefore before opting for MTNL connection think twice.