Airtel — I cant receive any incoming calls

Address:

New Delhi, Delhi, 110049

I cant receive any incoming calls from 2 days.
When i contacted Airtel they told me that it will be fixed within 2 days.I even went to their consultation hub but got no help.And i would like to add that i left my home to study in delhi and my mom and dad call me regularly but from some days they were unable to contact me so they were in tension for few days.

So I will be very glad if my problem is solved