Airtel — incoming call dropping

Address:

Bangalore, Karnataka, 560002

Calls to my number is not connecting. It says that the call is being forwarded and then after a long wait it disconnects saying that the number is switched off. I've not activated any call forwarding and to atleast know who've tried to reach me, i activated paid missed call alerts but that doesn't seem to work as well. I've raised complaint to customer service first on 29 sept 2018 and again on 06 oct 2018. The reaction from the customer service executives were not helpful and even if i consider porting, it will take a week and i am missing important calls.