Are you the Organizer of a Family Sharing plan where members are allowed to make purchases using your payment method?
If not, it sounds like your credit card has been compromised and you will need to contact the bank of the issued card to dispute those charges. You can contact Apple directly to verify if the charge is legitimate, but disputing the charge and a refund will still have to come from your bank as they are the ones that approved the charge. They would also want to close the current account and issue you a new card to prevent future charges.
Contact Apple Support - Apple Support