Airtel — airtel is charging me extra 250 every month

Address:

500081

I have been charged with 250 rs extra every month. I need to call customer care every month its really frustrating and highly irritating. Every time they tell me your issue will be resolved, but it is not been resolved. I strongly feel they are trying to cheat customer. Every time they confirm this is issue from our end and they will resolve it next time and it is repeated very time.