I would also save the auction page as a PDF and a HTML file and keep it on file, in the remote case you may have to prove your case.
and take a screenshot too

I ordered a plant a couple years ago on EBAy -from thailand and paid, never heard from the vendor and never received the plant . To be honest I didn't chase up either.... I just though to myself ' you silly woman you should know better!' Obviously I have never done it again!

May I ask what you ordered?