Managing personal Outlook.com account settings, security, and privacy
I understand your frustration.
Unfortunately, there is nothing that can be done to recover the account once the hacker has successfully replaced the account's security info.
Please be advised that Microsoft Support will not be able to assist with manual recovery, unblock, and escalation for this case, as stated in this article, that they are not permitted to send password resets, access, or even change any details on the account:
Moving forward, please check this link for more information on how to secure your account and to prevent hacking incidents:
https://support.microsoft.com/accounts-billing/manage/how-to-help-keep-your-microsoft-account-secure
Best regards,
Darhyl