I have been using IDEA

Sir,
I have been using IDEA sim for last five years.My sim is life time connection.The problem is on 20/11/07 i was working at my office and one number displayed on my mobile,i picked up the phone all of sudden i heared a command press 1 then Rs.50 deducted.This is not the first time.Two time before they done like this.They are not responding.Please solve my grevience as soon as possible.Two time i complained to customer care but all in the vein.
Shyamal Ghosh
G.M.Complex,West Chirimiri
Dist.-Korea(C.G.)
Phone-07771 263555
mobile no. 09826809906