Trai — tata docomo company recharge frauds

I am from panipat, hayana i want to sue against tata docomo company because they are providing wrong information regarding recharge. I recharged with rs, 98. As per their information 1gb data is provided for 28 days. But when i did recharge. And i check my balance then only 500 mb data is provided to me. When i called on customer care. They said only this data will be given. They always cheats with people with these types of wrong information