Click here, follow the instructions, and if desired, use this form to ask for a refund.
If the subscription doesn't show up in the list, ask any other people in your family group if you have one.
If the subscription doesn't show up on anyone's list and you weren't charged, forward the email to reportphishing@apple.com as an attachment and then delete it.
If the subscription doesn't show up on anyone's list and you were charged, use the form I linked to above.
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