MakeMyTrip India — refund not returned to original payment source

I have cancelled my booking which was booked via makemytrip.
Booking id nh[protected].
The refund has been processed almost after 16 days of cancellation, inspite of assuring that it would be done in 72hours. The refund has been credited to my makemytrip wallet. I want the refund to be credited back to the source which was used while booking.
I have tried their chat, but their executives refuse to transfer my fund back into my payment source.
I dont want to be forced to use mmt even if im not happy with them just because there is money in mmt wallet.
I have tried emailing but they are not responding to emails