Auctions Site Question

I'm not sure if this is the right place for this or not, but on the auctions site I somehow ended up posting selling the same Item twice.

The problem is I only have one of the items in question (a mini shiro).

Is there anyway I can delete the duplicate auction, or that an admin can do it?

Close the duplicate auction immediately if no one has bid on it. If both auctions have bids, send a message to all the bidders explaining the problem and close both, then restart it. That way everyone has another chance to bid on the item fairly.