It looks like someone else might be using your account

I can't log into my outlook account as it says "It looks like someone else might be using your account" and i can't verify my email address as its no longer in use. I've filled up the questionnaire too until it reached its limit but i still can't have access to my account. I can't remember most of the answers to the questions too. I need to check my mails urgently. How can I go about?