Unauthorised Apple.com/Bill transactions on bank account

This is primarily a user-to-user support forum; other Apple users like you. We don't have access to information about charges to your account. Apple has a support article about charges — see each of the steps in the following instructions. They include information on contacting Apple Support if the other steps don't help. See: If you see 'apple.com/bill' on your billing statement - Apple Support

or go to Subscriptions and Billing - Official Apple Support

Without there being anything in your Purchase History or subscriptions, it would indicate your card has been compromised. This occurs when your card is used on a retail terminal where there is a shimmer/skimmer installed to read your card numbers. You will need to contact your bank to dispute any fraudulent charge, since they are the ones that would have approved it.

I assume you are not an Organizer on a family plan that uses purchase sharing to allow family members to make purchases on your payment method. You can contact Apple directly to make sure they are fraudulent charges if there is any doubt, but it will be your bank that needs to resolve the problem and issue you a new card.

Contact Apple for support and service - Apple Support