Posting a fake testimonial is a form of fraud. It doesn't seem like there is a criminal case here, and a civil case is going to cost you more than you can probably collect.
You may want to discuss your situation with a lawyer in more detail. Most lawyers on Avvo offer a free phone consultation. Find a lawyer in your locale and discuss this case with them.
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I agree with Mr. Jaffe. This may not be worthwhile pursuing.
The response above is not intended as legal advice since it’s impracticable to provide thorough, accurate advice based upon the query without additional details. It is highly recommended that one should seek advice from a criminal defense attorney licensed in your jurisdiction by setting up a confidential meeting. Moreover, this response does not constitute the creation of an attorney-client relationship since this message is not a confidential communication because it was posted on a public website, thereby publicly disclosing the information, which is another reason to setup a confidential meeting with an attorney.
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