Reliance Jio Infocomm — Not providing refund of Jio fiber

I have cancelled my jio connection on 27 July 2020, submitted the device myself in the jio office on 9th February 2021 because no one came to pick it up. I received a docket number on March 1, 2021 (attached is the image).
It's been 1 month and I haven't received any kind of refund. There is no help from customer care. No one replies to my emails.
I am supposed to receive a refund of 2500 according to their scheme when I installed the connection. I haven't received even a single rupee.