Q: i got an email with an invoice number change me for Netflix which i didnt purchase

It may be a phishing attempt. If you determine it to be official, use the "report a problem" link and change your password. -AJ

http://www.apple.com/legal/more-resources/phishing/

Identifying fraudulent "phishing" email - Apple Support

Identifying legitimate emails from the iTunes Store - Apple Support

If it is official:

https://reportaproblem.apple.com/

Change your Apple ID password - Apple Support

Anti-phishing feature in Safari will show an alert if the site you're visiting is a suspected phishing site

Safari web settings on your iPhone, iPad, and iPod touch - Apple Support

Unfortunately Safari is not involved with iTunes purchases.