MakeMyTrip India — no refund of flight cancelled by airlines

My airline had cancelled my flight from kolkata to pune. Makemytrip told me that my refund has been processed on 26th of september and i should be getting it within 3 working days. I didn't. When i contacted them, they told me i would surely get it by the 1st of oct. Again the deadline passed and i didn't get a dime in my account.
I contacted them again and they said that it would for sure reflect in my account by the 4th of oct. Today is the the 5th, and guess what, i still haven't got my money back.
This is sheer harassment and the amount is quite hefty.