Xiaomi India — Mobile not take appropriate action about my cell phone.

Address:	Ahmedabad, Gujarat, 382350
Website:	www.mi.com/in

I m perchashing new phone from flipkart and then some time it"s caushing hitting and hang again & again.
Then i try to gave thise phone in mi care for 4 times but the ishyu came same and now my phone with thire care after 17/12/2015 till date.
So, now what can i do sir so plez help me...