Airtel — Blocked SIM Card without valid reason

Hello,

I have been using Airtel SIM card from past 8-9 years. Initially it was on postpaid until 2016, and prepaid after that. I have moved to USA for my education. In order to use all of my banking, insurance, PF (and numerous others) I have to use Indian mobile number to get OTPs.

So I have been recharging the number every month to keep it active and occasionally make a call too. They have blocked my SIM card last week, when I emailed they said its due to " to documents submitted by you, does not match with the details in our system Documents."

However I had submitted valid documents while getting the service activate initially and also while converting to prepaid. I clearly remember submitting passport copy.
After so many years they block my number stating such reason which doesnt seem to be true. I am not getting any response when asked what document are they talking about. All I get are canned responses. The email mentions that I have to visit Airtel store physically with documents .

Per TRAI rules and regulations my details were verified and SIM was activated only after that. So now all of sudden there cant be a change in it.

Due to COVID-19 pandemic there are travel restrictions and besides I can not just travel to India spending lakhs of money just for this sake which was already done per the rules and regulations .

I am asking them to reactivate my SIM card but have not any response towards it, I get the canned response.
The reason they are giving seems preposturous if not clearly mentioned.

I want to retain my services, even logging into email would not be possible if it remains blocked.