MakeMyTrip India — Refund for Booking for Tickets for 29th March

My refund for below request is not yet processed and expected date mentioned is 17th feb 2021. Need to know why it should take so long

Booking ID : NF[protected]

You are eligible for a refund for your flight. Your refund request [protected], [protected], [protected], [protected] for Delhi - Mumbai flight has been sent to Air india. Once the airline approves and processes the refund, it will be credited to your account. To get the refund in your original pay mode, please submit a request for refund