MakeMyTrip India — Refund amount not credited even after many months

I didn't receive the refunded amount yet even after many months. Air India express confirmed that they have already fully refunded on 15-oct-2020 to MMT(attached proof). But MMT not transferred to me and not responding to email, and can't connect IVR as I am not using the registered phone number. The customer agent says they can not connect to the respective department other than IVR. It seems fraudulent. I'm looking to file a case against them. Booking Id:NN[protected], NN[protected]; PNR (JZRNCE, WPRKRL). Always they respond by providing a robot chat support link which is useless.