HappyEasyGo — Refund not received even after 9 months

Booking ID[protected]
Case ID- CaseId[protected]

I had booked a flight ticket for May 2020 but due to lockdown Indigo cancelled the flight and refunded the full amount to agency (Happyeasygo). After that I have continuously been calling them at least twice a month asking for my refund. Everytime they say it will be refunded by next week. Now it is almost a year and I still haven't received the amount.
This way HEG has held the money of countless passengers as seen by the number of complaints against them.
I want my refund. 5k+ is not a small amount to simply let it go.