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d21lewis said:
Have you gone online on another XBOX 360? They may be using your profile to play online for free. All they need is your saved profile. Go to XBOX.com. Search for your profile, and see what you've been doing recently. That should, at least, help you find the culprit. Or call Microsoft.

i played on another console but i used my hdd, so they couldn't have any saved information of mine, or could they?