Myntra.com — I did not received the product

I had placed an order for 02 qty set of curtains. However they failed to deliver the order. Then second time they we will refund the money and you can place another order we will make sure you will receive this time.
Again after placing order they completely failed to complete the order. Which led me to another loss. And now they r saying we will not resolve or refund the amount. They service isn’t good nor the products. Simply it seems there revenue r dropping now they r thugging customers with not delivering the product