How do i delete my account so it doesn't exist anymore. so it can never be used again.
Hey there, to cancel an account you should call Xbox Support (http://support.xbox.com/call-us). You can see some more information about Cancellation and Automatic Renewal on this page:
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Actually deleting an account is not possible. You could change the Windows LIVE ID on your account to something you don't use, but you aren't able to delete it outright.