How to unlock my Apple account?

If this is in the iTunes/App Store, see the 3rd link.

See the Apple Support article(s) below. 

If your Apple ID is locked or disabled - Apple Support.   *

If you have changed your ID or password, have you followed the steps in this article?

What to do after you change your Apple ID or password - Apple Support.     *

See the Apple Support article(s) below. 

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

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

iTunes Support – world wide   -

Apple Support schedule phone call     -

Billings and Subscriptions   -

If necessary, try Twitter.

https://twitter.com/AppleSupport.   -