Airtel — repeated inflated bill

Address:

Panchkula, Haryana, 134114

Its has become habit with Airtel to inflate my mobile bills for mob. No. [protected]. Last month also, artificially inflated bill was rectified after a complaint was registarad on this portal. It seems repeated negligence on the part of Airtel, might be due to malafide intention to earn profit by deliberately inflating bills.
A proof of it is the written acceptance of faulty bill on the part of Airtel just last month & then rectifying it?
Again this month, an inflated bill for Rs.1256 against plan of Rs 399 was generated specifying wrong charges.
I request the competent authority to penalise appropriately M/s Airtel for causing undue harassment to customers!!!