Micromax mobile replacement warranty

My micromax X412 went dead within month from purchase. It had come with 100 days replacement warranty with 72 hr replacement promise. I submitted my phone IMEI: 911564156428362 on October 7, 2017. As of today October 24, 2017, no callback. I call service center everyday, they say the phone has not come. I call custmorecare, I was told your phone is being repaired and wait for 5 more days for updates. Why my phone is being repaired? It is under replacement warranty. Micromax need to provide me new phone. Micromax’s indifference towards customer like me is exasperating.

Tushar Achha
Pune 411001, Maharashtra
Email: txxxxxxxxxxa@gmail.com