Myntra.com — Return picked up but not refunded

I had placed a return request for a grey enamor inner and the item was successfully picked up with another pink inner on 16th April by delivery agent around 12:30 - 1 pm.
I saw another return was scheduled for the same product after somedays. And now Myntra is saying that they did not receive the product and not refunding the amount.
I am attaching the ss for your ref.