It speeds things up a bit if when you first post you tell us what exact error messages you see.
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 . 😉
If it is another reason, post with more details.