unauthorized transactions made on my credit card

You are not speaking to Apple here, this is a support site made up of users just like you. If you want to talk to Apple, then you can do that here:

Contact Apple Support - Apple Support

Contacting your bank should be done because if your card information is compromised and used fraudulently, your card issuer must close your account and issue you a new card.

I recommend reaching out to your credit card provider immediately to report these unauthorized transactions. They can investigate the charges and work on reversing them as well as issuing you a new card.

Visit support.apple.com/billing to review purchases made on your account. Then, contact your card issuer.

Please follow the advice given by muguy. You are not making a formal request with your posting. You are simply posting information to a community forum where Apple users try to help other Apple users. We can offer advice on what steps to follow, but we cannot do anything that you are requesting in your post.