Xiaomi India — redmi 3s prime /phone not starting

Address:	Ahmedabad, Gujarat, 382350
Website:	www.mi.com , www.tatacliq.com

I purchase redmi 3s prime on 28/4/2017.
After one month uses my phone
Not working properly.
And after 2-3 days my phone automatically switch off so i go to mi service center and my problem solved but after some day again same problem happen with me.
So as above i go to mi center and my problem solved
But after some day its again happen with me
So in short this problem not yet solve
How many time i go to center

Please give me proper solution against this problem

Or replace my phone
Or refund my money

If you not solve my problem i compain against your company in consumer court

!!! I hope you can solve my problem with in week.
Thank you

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