You are overreacting. As LACAllen has said, this is probably a phishing attempt, and since you do not see it in your purchases nor on a credit card statement, it isn't something to worry about. There are constantly people out there attempting to get subscription information from people from a variety of places, and it seems iTunes is one of the latest targets. People are sent emails and or text messages claiming you made a purchase for something you would never purchase, for a large amount of money and then ask you to click a link in the message to dispute the charge. They hope you will log in with your information which they capture and then drain your account.
You can post a copy of the message here if you wish and it would help to make sure. You can also take a look at this support document to help you identify fraudulent messages. Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support