Airtel - Broadband Rental Refund

I got ownership of my broadband changed from my name to my wife's name. I had already paid one year advance rental for my broadband connection with nearly * months remaining at the time of ownership transfer. After the transfer, my wife started receiving monthly bills and I received a bill indicating a due refund of Rs ****/-. I was informed that I would automatically receive a refund in my account with in * months. However when I didn't receive even after * months, I visited local Airtel store and they took cancelled cheque from me and raised a SR and confirmed that I would receive my refund in my account with in * days. However I didn't receive any refund and SR was closed so I visited Airtel store again and they again raised SR. Since then I have got * Service requests opened which get closed without any action, made numerous long, difficult calls to *** and every time I receive assurance. I even sent emails along with canceled cheque to *** email id on their advice. Finally I reached out to Airtel Appellate who promised action with in **-** hours and it has been nearly * week since then and despite number of reminders no response received.
I am quite disappointed with Airtel and think I mad a big mistake by getting ownership transfer. I am planning to shift alternate ISP after this horrifying experience with Airtel and hope someone at Airtel will resolve my grievance.
My details are as follows

Deepak Taneja
BB landline number - ***********
XStream id - **********