I accidentally listed an item twice, what do I do?

If you don't want to pay the withdrawal fee, you could just edit it to something else. Or delete most of the content, make the price astronomical, shorten the run time and add something in the description discouraging anyone from bidding on it.

Or say it's a duplicate listing and say please don't bid, see other listing.

Kia ora, you can also get in touch with the team on live chat and aske them to remove your duplicate for free