Airtel — Airtel sim stopped working suddenly at midnight.

Address:

Sitaram Ganpati Apartment, Flat no. 208/B , New Punaichak , Patna -23

June 12, 2021, Patna, Bihar
Suddenly on 12th June, 2021, the airtel sim on my phone stopped working. Initially I thought it might be a phone problem. Restarted phone several times, changed sim slot, tried it in another phone, tried stopping other services like wifi. All of no use.
All this without any intimation from airtel.My exams are going on and it's my official number for any contact with college. Lost peace of mind due to this carelessness.

I would like signals on my phone be restored as soon as possible, and additionally they need to compensate for loss of peace of mind, and loss of opportunity due to missed communication during the period.