Tata Sky — Cheated me by selling 999 rs for 6 month

Address:

Banglore

Customer person called us and sold teh pack of 999 /Rs by telling it will be valid for 6 month but after 3 month pack got expired. When we asked them about this they are denied to consider this for 6 month and telling that due to its your problem you didnt checked your pack it got expired in 3 month .
I want my money back or else need to give me the access for next 3 months.