My son's account was hacked and deleted.

My son came to me to ask for help, as he was logging in to play Minecraft and in his log-in, it says that the account was deleted and couldn't be found. Also, another e-mail (*** Die E-Mail-Adresse wurde aus Datenschutzgründen entfernt. ***) replaced my son's microsoft account. Is there a way to get his minecraft account into a different microsoft account?

:)