No harm = no claim. Your recitation does not even remotely illustrate defamation. Unless there's more to the story, perhaps it's best to just move on.
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Using a tape recorder is usually a bad idea. In some states, both parties must consent to being recorded. Keep that in mind.
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In WA it is unlawful to audio record without the knowledge and consent of both parties. Whether or not the other person had an expectation of privacy is a HUGE concern, as you are basically admitting to unlawful conduct. Defamation is the act of sharing with a third party information that is false or harmful or wrong. As a private person, you do not have to prove that you have been damaged by this conduct, but your fact pattern does not even suggest that the business contacted any third party. That is the issue I see.
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