Airtel — 4g sim not activated after 24 hours

Address:

560090

On 13th december 2018, i had initiated the process from changing by 3g sim into 4g sim. After 12 hours, 3g sim got deactivated and i switched to 4g sim. Internet and calls are possible but the 4g sim has still not been activated since i havent been able to send or receive any sort of sms.
Please resolve this as quickly as possible.
Phone no. - [protected]