Have Escalated this issue to Airtel Nodal on 27th Dec and havn't got a resolution yet.
Ported from Vodafone to airtel in first week of November 2016. Since then I am unable to use 4G services on airtel. Airtel claims to have fix my issue 4 times. However none of the times issue was addressed.
Here is a list of SR filled with Airtel and Airtel closed all of them with out even addressing the issue.
Instead of filing multiple SR with Airtel Airtel has failed to fix 4 G issues on my phone.