Airtel — not replying of mails

Address: Sector 137, Airtel store, Gautam Buddh Nagar, Uttar Pradesh, 201306

I am sending regular mails to airtel store noida located in sector 137 to get some information, but they are not responding at all and also their contact number is also switched off. This is frustrating and unprofessional.
I am sending mail from [protected]@gmail.com

Also sent regular follow ups, but not getting any response.

I am sending these mails on coco. [protected]@airtel.com.

When i visited the store, they assured me that they will reply on mail but this is of no use. Also their manager's official contact number is switched off.