I had no idea that I was paying for iTunes. How do I get refunded??

You’re not paying for iTunes the app, nor its various functions.

You’re quite possibly paying for something that was subscribed, though.

How to cancel a subscription from Apple - Apple Support

Request a refund for apps or content that you bought from Apple - Apple Support

Or this is spam or scam mail, seeking to phish your Apple credentials.

Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

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. See each of the steps in the following instructions. They include information on contacting Apple Support if the other steps don't help: If you see 'apple.com/bill' on your billing statement - Apple Support