Consumer Redressal

Sub: Charged Extra for Internet Usage. I have a complaint on Tata DoCoMo Telecommunication company. I am a cdma postpaid billing user in this company from six month. In my jan 14 bill they charged me extra amount of rupees 1333/- for my internet usage. But i used just 2606 mb of internet in that month and for this i have activated one plan of rs 199/- 3GB internet for 30 days Pack on 14/12/13. and suddenly i realized that my use will be more than 3 GB so i requested company to deactivate the same on 21/12/13 and instantly activate RS 299/-internet pack of 6 GB for 30 days in my ac.on 21/12/13. they activated this pack but not benefited me.I got bil that showing no usage of any internet sevice from 22/12/13 to 14/01/14 and charged me for using of 2606 mb @ 0.50 MB. when i complain there they said in our system there is no any information of internet is displayed. and charged me exta amount of RS. 1333/-. they r ready to deduct Rs. 300 BUT i want full deduction in my bill. THANK YOU