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. Discuss the matter with an attorney under the protections of attorney client privilege before anything else. Far too many variables exist in the short post you wrote for any further observation by me.
Good luck to you. God bless.
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