your apple ID has been disable

I have the same message. Reset the password several times (running out of ideas for passwords I will remember) but I changed any new password and it still comes up with the same message: your apple ID has been disable. Now, I can't update, buy some apps that I need. I am using Iphone, Ipad and Mac mini with the same Apple ID.

Please help me to fix this problem. Some friend are thinking: "Only stupid man use Iphone". But I and people in my family used iphone 3 and now Iphone 6.

Thank you very much.

Tao Nguyen