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Yup. Say it's not yours. It's an AU, they will take it off.
Shogun is generally correct but it depends on the type of account and the user agreement.
Amex and some others hold an AU responsible for any charges that they made.
I would first contact the court house and get a copy of the judgment, if there is no judgment against you contact the CRA's, if there is though you will need to contact the attorney the filed the judgment.