Why is my Apple ID been disabled?

My Apple ID has been disabled lots of times and I can't seem to find out a way to enable it again I have been on lots of websites too try to find out why and everything is just saying too change my password I have don't that more than enough times and I am getting sick of this. Firstly when I made the account I used a good password and everything was fine and it comes up on the bottom of the AppStore page but when I go to get a free app I type in my password then it says 'your Apple ID has been disabled' and nothing else??someone please tell me why this is happening??