I have a charge on my debit card for $39.99, the description for the transaction says, “Apple.com/bill”.

See:

View your purchase history for the App Store, iTunes Store, and other Apple media services - Apple Support

If it’s not your’s - i.e. a fradulent charge - you need to initiate a dispute w/ your bank; quickly.

Click here for information. If the article doesn't cover it, use the link to contact Apple Support.

(238193)