A lawsuit in this matter would gain little. You have little actual damages that could be claimed in a court of law.
The law office of Anders Ferrington 601-316-8428 practices state wide. In no way am I offering you legal advice, and in no way has my comment created an attorney-client relationship. You are not to rely upon my note above in any way, but instead need to sit down with counsel and share all relevant facts before receiving fully-informed legal advice.
It dos not rise anywhere near the level of anything actionable for emotional distress. It also does not constitute harassment under the law. Slander is spoken defamation. Truth is a defense to defamation. You were in fact selling on mall property. It sounds like what you're disputing is the continued selling that the guard said you were doing--but you would have to show the court with admissible evidence that you suffered economic damages.
We do not have an attorney-client relationship. I am not your lawyer. The statements I have made do not constitute legal advice. Any statements I have made are based upon the very limited facts you have presented, and under the premise that you will consult with a local attorney. This is not an attempt to solicit business. This disclaimer is in addition to any disclaimers that this website has made. I am only licensed in California.
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