I was charged which I don
I was charged that I didn’t purchase at all
iPhone 8 Plus, iOS 13
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If you were charged your Apple ID account was used for the purchase. So either you made it and forgot (perhaps it was a subscription that you never canceled), someone you share an Apple ID with made it, or your Apple ID account was hacked.
You can review your purchases by following the instructions in this Apple support article—>See your purchase history for the App Store or iTunes Store - Apple Support
If you think your Apple ID was hacked, see this article—>If you think your Apple ID has been compromised - Apple Support