By chance, did you already try recovering your account by going through these steps: https://goo.gl/8HPfKr ? Keep us posted.
@TeamYouTube Help! My ancient youtube channel was just hacked and someone uploaded a video. It was never linked to a gmail and I can't remember the email associated but I have the username and probably the old password. How do I claim my channel back?
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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