Dude take a connection from the local ISPs, those that give you connection directly instead of installing modem at home. They always have much cheaper unlimited plans with no FUP but downside is they sometimes have downtime due to poor infrastructure.
Airtel is a waste of money whatever plan you upgrade to because of FUP. People only use Airtel if they can't afford a single minute of downtime. I have a 2mbps unlimited plan now (4mbps from 12-7am) from a local ISP and crossed 350gb BW last month easily. I used to have a wireless data card connection too earlier but high latency and packet loss in wireless connections make them useless for daily use.