Airtel — my airtel sim have stopped working

Address:

Krishna, Andhra Pradesh

My airtel sim had stopped working suddenly, there is no signal in my phone but other airtel user in my place are getting signals in their phone. My sim is from Uttarakhand state and iam in Andra Pradesh but it was working normally for past month. I tried rebooting my phone and changing sim slots but nothing is working. Its been three days now. I can't contact any costumer care service so this is my last option.