Airtel — refund broadband charges

Hi, i have raise a broad band request and paid the amount rs. 500 on 25/01/2017 as the broad band service was not feasible in my area for broad band connection. I requested them to refund my amount. I am following this issue with customer care & then submit complain to nodal team but haven't got any proper response from any one so i have contacted appellate team but then also i am unable to get my refund amount yet.

Regards,
Swati haldankar