HappyEasyGo — Cancelled flight refund

I had booked a ticket from HEG for 31.08.2019 however the flight was cancelled by the airlines and they offered complete refund.The refund was paid out to HEG on 05.02.2020 however they are lying to me till date that they have not recieved the refund.I have confirmed about the refund from the airlines itself
Ticket no[protected].

I really want to slam HEG with legal notice over harrassment of customer for over an year.