How to unlock a locked Apple ID on App Store?

You need to do what your screen told you to do, which is to contact Customer Support at: https://support.apple.com/HT208856

Hello,

If a message says 'Your Media & Purchases account has been disabled' - Apple Support read that eponymous support article if you see that message or one saying: “You cannot login because your account has been locked.” This is not something anybody on this forum can resolve for you. Tap or click on this link and choose the self help method, or a contact option ➞ https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362 .

or for additional telephone contacts refer to: Contact Apple Support - Apple Support

The special contact link I provided above is the most direct contact method to get to the right people at Apple and it is the one Apple suggests you use. If it does not work for you, try using the link in the support article or contact Apple starting at the top level general support link at Contact - Official Apple Support . 😉

First start here:

If a message says 'Your Media & Purchases account has been disabled' - Apple Support

Then if your account has not been reactivated, review the information provided here:

If your Apple Account is locked, not active, or disabled - Apple Support

Contacting Apple Support is done here:

Contact Apple Support - Apple Support