Airtel — refund from airtel broadband due to non installation of new connection

I have requested airtel broadband and the executive visited my residence and after showed me different plan, i choose plan and paid rs5306 for three months (Txn no[protected] on 27th june (Lalbag area lucknow). The confirmation message received in my mobile. How ever nobody visited my house and one day airtel rep called me and informed me that the junction box at your complex is full and new junction box need to be installed. Since i have no airtel ph connection, i was unable to contact their customer care (121), and airtel apps do not have facilities to register complain. I took the help of twiter and tweet conteneously to airtel official twiter handle. I received one reply and i was asked to share my contact no so that they will call me. Thorugh my contact, i came to know that airtel decided not to connect me due to tech reason and my deposit will be refunded. Till date no refund received by me. I also send repeated mail to up nodal airtel and there was no response. I do not know the outcome of my application. I feel i have been cheated and feeling helpless.