why can't I download any apps?

If you see a message that says 'Your account has been disabled in the App Store and iTunes' - Apple Support.    

Contact iTunes Support. See the Apple Support articles below for contact information.   

iTunes Support – world wide 

Apple Support schedule phone call       

If necessary, try Twitter

https://twitter.com/AppleSupport.          People have posted it may take an hour or more to get a response.

Welcome to the Apple Community.

When your account becomes disabled, Apple provides the following recommendation:

"This message means that someone tried and failed to sign in to your account multiple times. The Apple ID system disables the account to prevent unauthorised people from gaining access to your information. You need to reset your password, following the instructions at the Apple ID website".

Visit iForgot.com and follow the instructions there.

If on the other hand your message simply states that your Apple ID has been disabled, you should contact Apple ID Support and explain your Apple ID has been disabled.