Airtel — cheating in the name of my plan family

Address:

Bangalore Urban, Karnataka

Could not able to use the data and calls not able to receive for my child number, everything was ok, until have changed the plan from 1199 to 299, followed up for the past 3 months no proper response from airtel, hold connection for past 12 years... Need solution for the same... As on date data balance is 73 gb and network problem and always it says mobile not reachable...