Airtel — after port,the new sim shows no network

I ported my airtel sim from karnataka circle to odisha circle. I was given a new some and was told to insert it when the old one gets inactivated. When my old sim got deactivated, i inserted my new as instructed. But it doesn't show any network. Now both my sims don't work. Its already 7-8 hours and i have restarted my phone several times but still no network. This is so frustrating.