Hotmail has blocked my account

I tried logging onto my hotmail account from my new phone and then hotmail has since blocked my account stating that someone else is trying to access my account. It says that I need a security code to unlock it and the only way that it'll send one to me is via my email address, which, obviously, I can't access! The other option is "I can't verify my account", which I clicked on and then it asked me to fill out a form with all my details to send to a specific email address (I sent it to my mother's email), it has since come back saying that they cannot verify my account. I called Microsoft and they said that they couldn't do anything apart from suggest this forum to me so any help would be greatly appreciated!