Moderator's note: This website is UK-based, whereas the content of your post (and the timing of it) suggests that you're in the USA. Our laws, both criminal and civil are very different to yours, so (while we welcome questions from across the world), this might not be the best place to post questions relating to legal matter. (Perhaps Quora or Stack Exchange might be better for you?).
However, simply approaching your problem as one of making sense of what's been written, I can possibly see both what was meant to be conveyed by the statements in the letters and how it could easily be misinterpreted:
As I read the third letter, any visitor using the car port needs a visitor pass (which are normally only issued for after hours parking or for overnight stays). The only 'casual' parking is that outside of the complex ("by buildings 1 and 2"). So I can see why your vehicle got towed. However I fully accept that the wording is confusing.
(Here in the UK, private companies or individuals aren't allowed to tow away vehicles parked without permission on their land. They can't wheel clamp them either. Only the police, and other statutory authorities can do so. Otherwise parking has to be controlled by the display of notices explaining the charges that will be levied for unauthorised parking, with parking companies permitted to access vehicle registration details in order to bill drivers and, if necessary, to enforce payment through the civil courts. So your situation simply couldn't arise here).