Micromax Informatics — warranty

I purchased a smart phone on 9 dec 2018. My phone is in warranty period. Display of my phone got corrupted. Blur background is displaying. But when i reached service center at indore they were telling unwanted excuses such as your phone is being opened by someone else outside etc. After i insisted they opened phone and checked it. And now they were telling that your phones display was pressed (Screen दब गई hai). That's why the problem is occurring. Same happened with service center at dadar, mumbai. I visited there so they told someone else opened it so i told that i get it checked in service center at indore so they were telling excuses like service center will put seal on that small screws used to pack the mobile and checked and refused to repair my phone under warranty and asked for 3300 rs. To change the display. But neither my phone was opened by any one else nor my phone was fallen or any such thing happened that screen get pressed. And co. Is refusing totally to repair it under warranty circumstances.