how to undisable appstore account

Howdy! This is a community support forum, meaning this is a place where other Apple Users can give you advice and support. However this is a case where you need to contact Apple Support.

Here is an article with more information:

If your Apple ID is locked or disabled - Apple Support

Here is a link to Apple Support:

https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362

The second link opens a support portal specifically for locked accounts.

Hope this helps!