You would have to start by contacting the Attorney General's office and making a report to them, since they have the authority to investigate such fraud complaints, as it is the filing of a public document purported to have legal efficacy. If you know the party's name who filed it, then you can also go to the clerk of court's office where it was filed and check the cases under that person's name and try to obtain a copy of the document, which is public record. Other than that, your only other recourse is to notify the other party in the action and then let them raise the issue with the court, since you would not have standing to do so in that case.
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