Myntra.com — They delivered defective product and now aren't accepting return request

I ordered a pair of heels and for one of the show base was missing when I received the product. I raised a return request and they picked the product and very next day updated in the app that return got rejected. I asked them to show me the proof that the product was fine at the time of shipment but they are unable to provide me that. They simply are doing fraud here.