Review your purchase history here:
View your purchase history for the App Store and other Apple media services - Apple Support
Each transactions requires the explicit action by double clicking the side button with the amount on the screen, followed by verification with FaceID/Touch ID or Passcode. It is also possible that the transactions may have appeared as "Pending" first and the charge did not actually go through until later. Contact Apple directly for more details about the transactions.
Contact Apple Support - Apple Support
You can try requesting a refund, but they are not guaranteed due to the required steps to initiate and authorize a purchase.
Request a refund for apps or content that you bought from Apple - Apple Support
Usually you also get email confirmation on purchases, did you receive those emails that may also have a link to Report a Problem?