Reliance Jio Infocomm — Refund of security deposit of Rs.500

I just want back my security deposit of Rs 500 since I ported my jio number from postpaid to prepaid. They take the money on time but forget to refund it. I've been complaining for the money for the last 30 days but no response from them. My bank a/c number is link with my jio app. So they can easily transfer the money to my bank a/c. I'm really in need of money now since I don't get money from home nowadays due to covid situation.