Airtel — cheating on customers

Before recharge i check my offers it shown 200 mb for 30 days at rupees 29. But i just got only 165 mb for 3 days. and i called them and make a complaint but they didnt help me..iam not good in english so i cant explain the problem with more expansion...kindly request you to make some move against this kind off cheatting.This is not a first time i cheated from this company