Airtel — Airtel SIM Stopped

Address:	Punjab
Website:	www.airtel.in

I am Using airtel Number from last 10 year
but from this last 2 months Suddenly SIM has stopped working
I am working in UAE, not able to visit India to get sim
I have sent my Family member to airtel store for Re issue new SIM
but store executive denied to give
they need my signature
Even i have called Customer care 2-3 but not able speak after 15-20 call on hold
can somebody assist me on this how to reissue new SIM