MakeMyTrip India — was assured surname change in the new tickets but did not

Address:

C/O. Biswanath Pal, 180 R.K. Banerjee Saranee, Dakkhin Para(Printing Factory), Mankundu, 712139

I had a problem with the surname of two passengers i booked the ticket of traveling alongside me on 30th of december 2019 from delhi to kolkata on flight sg-372. I called them they said in a recorded call that they will speak to spice jet and call me back (Incident took place in 23rd of december, 2019). As assured earlier they called me back and mailed me to send the correct id proofs to spicejet and they will reply back with the updated tickets.
I was assured the same. Then 2 days passed on the 25th i received a mail from spicejet that they don't have a policy to change names so they can't do as i was promised by makemytrip, so i called back at makemytrip and they said they will look into it. Then again after 2 days they called and asked me to book new tickets with correct names, and i will get the refund of the original booking price along with the fare difference. Just they needed a verification that would take just 2 to 6 hours. It was on 27th of december, 2019. Then next they called me on 1st of january 2020 trying to convince me it was my fault, but i quiet rightly have a mail which says that they will send me the corrected ticket that was assured. I am also attaching the screenshots please have a look, they did give me the assurance that i will get my new tickets. But unfortunately now they are trying to prove me wrong.