Airtel — Broadband Connection Refund not received since August

I made a payment to opt for a Broadband Service in Muzaffarnagar. I was given a link by the Airtel Representative to make the online payment to confirm the installation of a connection. I made the payment of Rs 8150 via my PNB debit card. After payment I got confirmation from airtel team that my payment is confirmed but next day I was told that my payment failed and If any amount debited will be reversed in 10 days. But after 10 days I got no refund so I was told by the airtel team to contact the bank. After mailing the bank I got confirmation that payment was successfully credited. I mailed airtel and airtel asked for proofs and after providing the proofs. Airtel team on phone assured me that I will soon receive a refund. Since then airtel team on twitter is asking me to wait and no resolution. I tried contacting local sales guy regarding this he tried to abuse me on phone. The person name is Kapil [protected].

I am attaching the payment proofs.