give false promotion of gprs pack and deduction of money

Location/place: gwalior

Name of company/service: TATA DOCOMO

hello,
i had got a mssg from docomo on 23 feb 2013.the mssg is about if i recharged my number with 69 ruppees then i got a 1.5 gb of gprs data.
so i recharged my number but i got only 750 mb data.i called to the customer care they said that please adjust this time.they give false information to the customer for earning money.my number is 9589699009.please pay u attention on this i will be thankfull.