Xiaomi India — Redmi note 3 defective piece

Address:	411057
Website:	www.mi.com/in

I have bought redmi note 3 phone on 22 june 2016. from the day 2, it was hanged. i have contacted their customer support team on mail and call various times (8-10 times). but they haven't respond me even single time.
I have sent image of phone during hanged also i have called there support team as well as post on their official twitter account but i didn't get any resolution.

Please help me.