If someone has taken your account and you can no longer log in to it, you need to call Support for your region. The Xbox LIVE support numbers can be found in
The fact that you've posted someone's email address here, suggests to me that you have given a subscription code away. If that is the case and you are still in possession of the account then there is nothing that can be done.
Do not give your subscription codes to anyone that you don't know. Never share your log in information with other people on Xbox LIVE.
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