What was this 39.99 charge for?

Where are you seeing this charge? If you received a text message telling you about a charge, there's a good chance it is a scam. Have you checked you credit card or bank statements to confirm the charge?

If you have confirmed it's a genuine charge, you can view your purchase history using these instructions:

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

You'll also find a link in that article on how to request a refund.

Hello~ Where are you seeing this purchase? Click on below and review…

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

Note once inside the link above you may click on other tabs of interest for more helpful information. If you are seeing this charge on banking/credit card only contact them to make sure your information hasn’t been compromised and in the hands of a fraudulent user. Post back if needed. Take care.

~Katana-San~

Settings , “you” , subscriptions. There, you can check all the features and subscriptions you’re paying for and you can turn it off.