Managing personal Outlook.com account settings, security, and privacy
An account deletion request takes 30 to 60 days to complete and can be canceled by logging into the account within this time.
If your account is showing information that the account does not exist, it is possible that your account has been hacked and the email address has been changed. I suggest you fill out this form https://aka.ms/recovermyaccount, which will be sent to a team specially to handle this type of issue.
Use this guide to help you complete it; https://support.microsoft.com/account-billing/guidance-notes-for-the-microsoft-account-recovery-form-4dd8fef1-33d2-4fbe-9352-66127ab9b50e
You should receive a response via email. It may take up to 72 hours. If you don't receive a response after this time, please check your spam folder.