I don't know, I've never been double charged. Since you normally have to click the 'I agree to pay $.20' when listing, I don't know if support will do anything. You can always reach out to them. But it depends on how much time you want to spend dealing with it. I would rather take the small loss than try to spend time explaining what happened to support to see if they'll compensate you.
Or if you have anything else you'll be listing soon you can edit the information and photos in the duplicates to be for a different listing instead of creating a brand new one and paying a new listing fee. That's what I would do, but I always have a long list of items I can add to my shop, it's different if you don't have any more to add.
Unless a bunch of people come forward saying the same thing recently happened to them it's fairly pointless to contact them about it being a technical issue. They'll just tell you to post it here (which you've already done) and if it seems to be affecting a large number of sellers then they'll look into it. If it's not, then they won't spend any time investigating it.
