how to stop unauthorized purchase
I received an email stating I had made a purchase yesterday for $30.99 I did not make this and my credit card had not been updated but this purchase still was made. How do I fix this
iPhone 6 Plus, iOS 12
If the only indication of the charges is from an email or text, be aware that it may be a phishing attempt to get you to log in to a site that appears to be Apple and divulge your password or credit card information. See: Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support
and Identify legitimate emails from the App Store or iTunes Store - Apple Support
If it is a real charge, see the following instructions. They include information on contacting Apple Support if the other steps don't help: If you see apple.com/bill, itunes.com/bill, or an unfamiliar charge on your statement - Apple Support