It could be your card has been compromised and a this is just plain card fraud. Apple wouldn't know that that's what's happening and you should really be dealing with your card company about it.
Unless your account is still active and you have left a card on it for the past 15 years (I don't even leave any kind of card on my accounts and I remove them a minute after my purchases have completed), you shouldn't see a charge through the account. Have you looked in your purchase history? Read this support article for directions about how to see your purchase history in the App Store or iTunes Store [mobile device, computer, or web] --> View your purchase history for the App Store and other Apple media services - Apple Support
If the charges appear there then your account is indeed still active and you should have removed your card 15 years ago because your account is compromised by a fraudster. In that case the charges are still a matter for your card company but you should also either officially deactivate the account or delete it entirely once this is over.
How to deactivate your Apple Account - Apple Support
For information about how to delete an Apple Account (formerly “Apple ID”), read this support article —> How to delete your Apple Account - Apple Support
Carefully and thoroughly read that article for information about what happens when you delete your Apple Account. For example:
"Make sure that you sign out of all your devices to avoid issues with apps that use your Apple Account or iCloud. After your account is deleted, you can’t sign out of iCloud or turn off Find My iPhone Activation Lock on your devices. If you forget to sign out, you might not be able to use your device when your account is deleted."
Read this document if you think your Apple Account has been compromised. --> If you think your Apple Account has been compromised - Apple Support
For iOS 15 or earlier, if you want to see if anyone else has access to your device or accounts, click here --> Checklist 1: Limit device and account access - Apple Support
For iOS 16 or later see how Safety Check on iPhone works to keep you safe. Safety Check for an iPhone with iOS 16 or later - Apple Support
Use the information in this document to check your Apple ID device list to find where you're signed in --> Check your Apple Account device list to find where you’re signed in - Apple Support
Related materials:
Personal Safety User Guide
Personal Safety User Guide - Apple Support
> open the Table of Contents and review the articles
A document with general information about security and your Apple ID --> Security and your Apple Account - Apple Support
Contact Apple for help with Apple ID account security. This page provides country-specific Apple Support contact information ➞ Contact Apple Support - Apple Support