Sending, receiving, and organizing email in Outlook.com
Sorry to hear you're having trouble.
As this this an open forum I'm afraid that no one here would be able to help beyond offering advice regarding the sign in helper. As for the suspension that may have been done by the policy enforcement team if you used the account for Xbox. Usually though the message you get does suggest that the unusual activity may have been if it was sending spam emails or something else like it.
Right now the best option I can think of for you would be to try starting an online chat via https://support.microsoft.com and clicking on Contact Us. Just follow the instructions until you get to a person. There's no guarantee that they will be able to do so but they may be able to at least give you a bit more info.