Airtel — Airtel - Sim card registration failed

My Airtel prepaid mobile xxxxx06660 service stopped working since 09/06/2021 due to the error Sim card registration failed. Tried using a different phone but never worked. I tried contacting Airtel customer care many times and none bothered to look in to this matter.

I had already sent many emails to the Airtel Appellate authorities (reference number ##76811). This is not acceptable since this is the main number my family and relatives use to contact.

I want some higher authorities from Airtel to look in to this and do the needful ASAP. I want Airtel to compensate for the loss that they have made to me and should pay for the difficulties I had to gone through because of their poor service.