Airtel — sim stopped working since 26th august 2019

Address:

GH217 Gilberth hall National Institute of Industrial, Engineering, Vihar Lake Rd, Powai, Mumbai, Mumbai City, Maharashtra, 400087

My sim suddenly stopped working, I tried restarting and removing the sim,
other airtel sims are getting network, please resolve this issue.
I am also not able to contact you through mail as it is asking for registering, which requires OTP, which requires my sim to be activated, your customer care is really difficult to get a hold of.
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