I found this looks like you have to wait until the auction ends if you are the winner or hope someone out bids you before then
Refunds from auctions are handled automatically after an auction has completed. Auction winners may file a dispute for a credit refund 3 days after the auction has ended. If your auction is eligible for a credit refund it will be stated on the auction page with a link/button to start your claim. Auctions are closed after 60 days and credit refunds disputes can not be filed after this time. Listed below are the possible outcomes of a credit refund dispute.
Winner: requests refund, Seller: no response The winner will receive an automatic credit refund 5 days after the dispute has been filed.
Winner: requests refund, Seller: replies with reason The seller can approve or disapprove of the credit refund request. If the seller approves the winner will get their credits automatically. If the seller disapproves then Listia will look at the details of the transaction and issue credits one way or the other.
I was going to bid on this blouse, but I can't now. I did the same thing you did once and I was stuck with it. So you got this beautiful blouse for 9000 credit's. Personally i wouldn't look at it as being a mistake the blouse is worth 9000 credits.
I'm sorry I can't end the auction early and I can't refund your credits it's telling me the bids only at 1010 right now so I can't do anything until the auction ends and I see who wins and for how much