Hey Valerio! Nice to meet you!
The only way to recover a hacked account is through the official Microsoft website:
If it doesn't work, and since the email address has been replaced by the hacker, I'm afraid there is no other working method to recover the Microsoft/Minecraft account or the purchased Minecraft game license, and Microsoft Support cannot help either.
However, I would recommend reaching out to Microsoft Support immediately as they can possibly suspend the account permanently once they have confirmed that the account can no longer be recovered in order to prevent the hacker from using the account:
Type "Microsoft 365 sign in problem" > Contact Support > Microsoft 365 and Office > Billing and Account Profile Questions > Confirm > Chat with a support agent in your web browser
Phone Support: https://support.microsoft.com/topic/customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2
Thank you for your kindness and understanding.
Best regards,
Darhyl