Airtel — airtel 149 plan - ap"

What happening in airtel company, i do not understand? I have opted "airtel 149 plan - ap", but, your people are charging 100 rupees more every month in my month bill, so, many times reminded to your local office, even though, every month charged rs.100/- as 249 plan, why this happend in your company, are you cheating your customers? I need your clarficaton and revert back the money whatever you have charged against my account for the same.

I hope this query will resolved on top priority & pl check the bills for latest 18 months bills and update my account accordingly.