Airtel — excess amount charged every month

Address:

Thane, Maharashtra, 401202

This is asif memon and my number ([protected]) is being overcharged every month since last 3 months. I have to call customer care and the amount gets deducted and also i have been informed everytime that from next month onwards it will be not charged. But this does not happens and i have to call every month to customer care and get it deduct.
Also i have mailed them and i have been informed that it will be not charged henceforth but still they charge me despite of mail.