Vinted complaint: Vinted support scamming !

I sold a brand new curtains worth 90 pounds reduced to 50 to a person on Vinted. Yesterday I found a message from Vinted saying the transaction is canceled and the buyer is not obligated to return the item!!!! The buyer said the packaging came wet and the curtains smelled bad! Vinted approved the refund due to what they said a bad packaging ! The person didn’t upload the packaging photos nor the curtains photos! She just uploaded a photo of a leaflet that was inside the packaging that was not even damaged. Vinted didn’t ask me for any photos of the packaging from my side. The buyer didn’t even say the curtains were damaged, she just complained about the smell. When I contacted her she said she is not obligated to return the item then blocked me! Where are the photos of the my item??? Where is the damage in the item??? Is a bad smell considered damage? How can anyone prove a bad smell? And the most important thing is , why Vinted didn’t require the buyer to return the curtains even if I pay for postage ???!!! This is an absolute theft !