Make my trip - Make my Trip not issuing refund

I booked a flight on MakeMyTrip
Airline: GoAir
Lucknow to Bangalore
Date of travel: **st July, *:** pm
The airline then rescheduled (pre-poned) my flight to **st July, *:** am citing operational issues.
They gave me an option to either reschedule or get full refund. At this point, I rescheduled it to *st August, *:** pm
However, the airline once again modified the booking to *st Aug *:** pm on their own citing operational reason once again. They gave me the same two options again: reschedule or get refund. At this point, I chose to get a refund.
Now, the airline has sent a confirmation mail with full details that they have refunded the full money to MMT but when I called MMT customer care, MMT is saying that they haven’t received refund and I am not eligible for it.
This whole episode is the airline’s fault. If they have refunded the full amount to MMT then why MMT is not giving me my money back?
Other information relevant to booking:
Customer name: Shriya Singh
PNR: OFJFHE
Airline: Go First (or GoAir)
MMT Booking ID : NF**************
Amount paid : INR ****