When attempting to log into my existing hotmail account, I get a message saying someone else was trying to log in as me, and it needs me to verify it is actually me logging in, so to do this it wants to send a security code to an old email address. I don't remember the password to my old account so can't log in to get the security code, and it won't let me reset the password to the old account because its not a valid microsoft account (or something like that). I do not have the option to send the security code to any other email addresses or mobile numbers.

I have also tried clicking "I can't verify my account" to fill out the small question sheet, however apparently I could not provide enough information to prove myself to get the security code.

What can I do?