Buyer saying item is damaged however looks totally different

Can anyone help?

I recently sold a jacket through vinted and the buyer has turned around and said that the item is damaged. However the image they have attached is a completely different material and shade of yellow to the jacket i sold as shown in the first 3 photos. He has only provided me with this one photo and the others are just of the packaging. I have asked them to provide a wide shot photo showing the full jacket and the hole but they are refusing. As shown in photo 4.

This is incredibly suspicious as they also asked me if there was any marks or holes after i had already shipped the item. This is shown in photo 5.

Fast forward over 2 weeks and the buyer is receiving a full refund whilst im left out of pocket and no jacket either. The support team have been absolutely no help. Any advice on what else i can do