Myntra.com — They delivered me a damaged product but when I made a refund request they refused

I Ordered a t-shirt from Myntra( Order ID # 1179666 [protected]) but unfortunately the product delivered to me in damage condition so I made a exchange request with a smaller size because it was a demage product and also the size is too large but they cancelled my exchange request by saying that it's a damage product so it can't be exchange. Than I made a refund request against that damaged product but they again cancel my refund request by saying that a correct product was shipped from their warehouse. But my question is that how can they ensure that they delivered a correct product. Is their delivery boy showed me the product at the time of delivery by removing the cover. If not than how can they reject my refund request while I made it before the expiry of time.