How do I cancel a pending purchase for an expired in-game deal?

I accidentally made purchase for an in game limited time deal. The deal is over and so it doesn’t exist anymore. It was like $21 I have had the money in my account for like 3 days now. But it won’t go through. So i don’t know if it won’t go through since it doesn’t exist or what. I just want to either pay it or cancel the pending purchase so i can use my App Store again. Any suggestions or solutions?