Why can't I log into itunes with my apple id

What happens when you try? Error message(s)? ID disabled?

Apple ID disabled - Your account has been disabled in the App Store and iTunes

Contact iTunes Support. Either use the form or scroll to the bottom of the page in the 2nd link. Follow through the screens to get a chat or telephone option.  

iTunes Support

iTunes Support – world wide

To all seeing this post: Do NOT call the listed number. The number is being posted to numerous threads by scammers.