Fraud is actionable if certain elements of proof are established by the evidence. Using the written documentation you have is a good place to begin. Contact a local lawyer - many may give you a free consultation for an hour - to discuss your specifics. Far too many variables exist in the short post you wrote for any further observation by me.
Good luck.
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A little more information would be helpful. I would guess that it is the filing of a false document or something similar. Generally, in civil court you have twenty days to file and answer. You should have received a summons that tells you how long you have to file an answer.
Generally in civil court you have 20 days from when the summons and complaint are served to file a response -- generally a motion to dismiss or an answer (with any affirmative defenses). If you don't file and serve a response within that time, the plaintiff may seek a default and default judgment against you. If you want your day in court, don't delay any longer. If a default has already been entered, the sooner you seek to set it aside, the better your chances.
