MakeMyTrip India — Booked cab by using flight no. for pickup from airport

Flight ticket booked on 24th January for travel from Madurai to Chennai 25th morning SG3028 flight time 10.30 am to 11.50 am. Also booked cab for pickup from Airport to chennai city by entered the flight no.
But cab arrived on 24 th Jan 11.30 pm instead of 25th Jan 11.30 am.

Araised complaint on that day itself to MMT. Informed by CC person my money fully refund within 48hrs.

But still not happened