Why are you guys charging my visa I never signed up for any type of purchases?

You are not addressing Apple here. This is a user to user support forum and Apple does not participate here. If you wish to speak to Apple Support, you need to use the Contact Support link at the top of the page here. 

If you saw something on your bill, see this, If you see "apple.com/bill" or an unfamiliar charge on your statement - Apple Support

If you received an email, it was probably a phishing attempt to get your account information. Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

See this to help identify legitimate mail from Apple. Identify legitimate emails from the App Store or iTunes Store - Apple Support