Airtel — No Network from 11/12/2021, which was working till 10/12/2021

My Airtel prepaid mobile service stopped working from past 1 days. Tried using a different phone but never worked. The Tower on phone shows deactivated cross.

This is my primary number and i leaving in QATAR DOHA. I did called to Airtel customer care, but not received any solution. In fact it was informed that my number is active and there is no issue.

Request you to look into this issue and resolve.
My Airtel prepaid number is +91 [protected]
Mail: [protected]@gmail.com