Airtel — upgrading to airtel 4g sim

I went to the airtel store in ashok nagar, chennai to upgrade the existing 3g sim to a 4 g sim. Once i received the 4g sim i did the necssary to activate it. However my phone shows "no service" inspite of having activated the 4g sim. I am currently using my 3g sim only which is bad since network isnt available most oif the time.
The number is [protected]
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Airtel customer support has been notified about the posted complaint.
Sep 04, 2017
Updated by Aishwarya Raamkumar
i even tried dialing 121 to get assistance but no option fits perfectly to deal with my problem.
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