Myntra.com — cheap and local product delivered and refusing to return

Website:

myntra.com

I have purchased nike - men navy & black lunarconverge 2 running shoes.
Instead of which myntra delivered some nike copy shoes next day. The seller deliberately delivered the copy nike shoes in its original box, after days of conversation with myntra they refused to return it and saying it is original product.in which world it is an original product of nike?
I paid 4200 for these instead they gave me 499 worth nike copy.
Been a loyal customer since myntras inception. But they cheated me and are supporting that shameless seller who delivered these shoes.
Kindly look at the images of shoes
Placed on: 03 apr 2018
Order no:[protected]-0107603
Total amount: 4, 244.28