Airtel — Money not refunded for service not provided

I had raised a request for Broadband router backup device and paid 1498 INR through Airtel App for the service on 11th January 2023. As device was not available so agent cancelled the request and even on the Airtel App its not showing anything pending. I called Customer Care multiple times from January month and complaint about the issue but till now I didn't receive any refund from their side. Its been around 3 months now. Now I have already purchased other device for the same purpose, I would like to get my refund asap.