MakeMyTrip India — Refund by airline not being credited to my account

Address:

Gurgaon

Go Air has refunded an amount of Rupees 12, 458.00 against the cancellation from airline side of my PNR number J4845F vide the airline e-mail dated March 15, 2021. However, MMT is showing that the ticket is cancelled and no refund is due. I have repeatedly tried to rectify the status and also tied to talk to the customer service executive who after about 15 minutes on keeping the call on hold on Match 18 at 15:28 hours disconnected the call.
All my further attempts at a resolution have been totally unsuccessful