Unassign console from a account that i forgot

Hello, i need help about getting m'y Wii u console unassigned from a account that i don't have access to. I forgot the name and the password of thé account i probably don't have the email Because i switched to Google email (was originaly on outlook)

Here is one of the fc of the Wii u:
0306-6713-8125

Thanks for help in advance Image may be NSFW.
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