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There’s a lot to unpack here.
First, what you’re describing it probably not harassment. Harassment is “unlawful violence, a credible threat of violence, or a knowing and willful course of conduct directed at a specific person that seriously alarms, annoys, or harasses the person, and that serves no legitimate purpose.”
Second, ask them what rule they claim you’re violating. The first notice of violation should have outlined that. It might not be a parking issue but a vehicle issue.
Third, fines can add up over time. But there might be a limit to how much they can fine you. Check your state laws and declaration.