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Keshav, u r not alone, multi thousands of Mi users are cursing Xiaomi for its well planned pathetic after sales support. until an issue is there its a good piece. I too had issues. Even HCL is to blame as Xiaomi's partner service center management in India.
Sharing with you and for all the users too, a step wise process to deal with this and any consumer related issues in India. But strongly for Xiaomi as its a hell experience with them as no one from Xiaomi India and Global including Lei Jun replies to complaints on Facebook & Twitter and some Sofia here on Mi Community would chase you to divert and convince of some plan and may ask for your passwords, dont give away for sure.
Take screenshots for all communication you made and save it on alternative device/PC for future reference
This is manufacturing defect at all a wrong type of glass is placed over you know that Mi can't solve your problems so go to shop ad buy a high adhesive tempered Glass that can't break easily must clean all over screen clearly and you can also try a good flexible screen guard