Did your customer accept the Offer and pay?
You ship.
If you dont, you get a Strike on your Selling account, which, if you get more than one a year, can mean higher selling fees, restrictions on the number and value of your listings, or even a closed selling account.
Did you just notice it, but no reactions yet?
Close the listing immediately.
Revise the listing as necessary.
Relist the listing.
All of which should take you five minutes, although it may take up to 24 hours to "re-index" and be Searchable.
Best Wishes.
