Hello, my friend told me he was going to hack my account and i didn't believe him, then when i got home i tried to log in and it said that my "Membership information was invalid". So now i don't know what to do.
You'll have to actually phone Xbox Support for the to conduct an unauthorized access investigation. Meanwhile, change the Windows Live ID and password on your account so others can't gain access to your account and information.
Hello UnshapernMite3. If your Account was Compromised then contact Xbox Support and have them open up a Unathorzied Access on your Account. They will lock your Account and start an Investigation. Contact them through here -
support.xbox.com/contact-us File a Complaint using the Tools on the Xbox 360 if you believe he took your Account.
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