Airtel — unfair charges by airtel

I am being charged rs 300 / month for a "booster plan" offering me 1 gb data per month. This despite my call to airtel months back requesting them to remove this "booster plan". Even after having confirmed by airtel executive, am continue to being charged for this "booster plan". I have very clearly mentioned to airtel (Twice, if am not wrong) on how can they charge any customer rs 300 for 1 gb data when in these times, users get 1gb data / per for negligible amount compared to what am being charged for "booster plan".

I request you to please take following actions:
1. Recover my call requests to airtel.
2. Investigate the matter.
3. Refund my money which was unfairly charged.