Airtel — poor customer service from airtel store

Address:

Chennai, Tamil Nadu, 603103

I have just ported to airtel. I would like to register complaint on poor customer service from airtel store, navalur, chennai (Near ags cinemas). The staff are providing the customers with wrong details due to which i had to face a loss of rs.700.
I would like to raise complaint particularly against mohan raj, working there. The way he responds to the customer is very rude and not at all responsive.
Please take necessary action.