MakeMyTrip India — Airfare difference dint receive since a month

I am regularly fighting since a month to get back my airfare difference amount which indigo airlines has already paid MMT. It says they have refunded amount on 2nd Aug 2021.more than a month till datw there is no amount received of Rs.700 and Rs.1029 as a cashback scheme. I shared all my relevant statements with them. Still they are unable to figure it out where that money has been. Such a sick and unprofessional, lack of knowledge customer support. Moreover they are managing to call and say money has already been refunded in august..but where that money is?????.