Airtel — 4g sim not activated after hours

Address:

Bangalore, Karnataka, 560095

Upgraded to a 4g simcard today. The old sim was deactivated after receiving a message stating my new 4g sim is now active. But, both the simcard aren't working now. Waiting for hours in vain. Why does this company give false advertisements about their services. Also, there isn't an option to connect to it's customer care executive through airtel prepaid number