Asus India — defective product

Address: Jaipur, Rajasthan, 302004

Bought asus r558u on dec 12, 2016. It has not been a day since that this laptop has run smoothly without any glitches.
Not only is surprisingly slow to do anything, it shuts down on its own, it hangs, the screen turns black besides that drivers are causing trouble.
I think this is a fake product and i have been conned into buying this.
This product is still under warranty.
I either want a refund or i want a brand new replaced product.
Kindly look into the matter.