Airtel — no network on airtel sim after using for 15 days

Address:

Kolkata, West Bengal, 700136

Hi I recently got an Airtel Sim with 84 days unlimited calling and net. After working fine for a few days, there is no network signal on my mobile from today. The tower isn't showing at all even after restarting and resetting the sim and network. The affected sim no.is [protected] and my alternate number is [protected].

Please help.