Shoppersstop.com — Exchange fraud - Shipped product but they are saying they received different product

Received the product on 28th March, placed return request on next day as the size was smaller than what I wanted.
Delivery guy picked up the product, called them after 10 days asking for what the status is, they are saying they received jeans whereas I ordered white shirt and given the same as return.

Now they are saying they can ship back the jeans but what I will do of this jeans, I ordered shirt should receive the same.