Since this is a business entity which you are trying to protect, I suggest you invest in retaining an attorney to deal with Frank in Chicago. Perhaps a letter on legal stationery from your attorney, threatening him with legal action if he persists in defaming you, will result in his behaving himself. A letter from a local Chicago attorney may be most effective, as Frank would know that the attorney is in the area and could easily go to the courthouse to sue him.
Mr. Lundeen is licensed to practice law in Florida and Vermont. The response herein is not legal advice and does not create an attorney/client relationship. The response is in the form of legal education and is intended to provide general information about the matter within the question. Oftentimes the question does not include significant and important facts and timelines that, if known, could significantly change the reply and make it unsuitable. Mr. Lundeen strongly advises the questioner to confer with an attorney in your state in order to insure proper advice is received.
You definitely need the assistance of an aggressive attorney that will cause the slander and libel to cease and desist.
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