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Perfectly legal, albeit incredibly stupid IMO..................

Yes they can. Like a store, they can bar customers they don't want.

Not clear why you are telling us this. Did you have a question?

Of course you do. No different than when a bank mistakenly puts money in your account.

Seems like a good offer considering your lack of damages.

One way is when people make confessions on line. Quit posting and hire a lawyer.

The court rules, which are on their website, will answer your question.

There is evidence, as per your own message. Testimony is evidence, and often the only evidence.

Whether is is advisable to speak to your stalker is a personal issue, not a legal one. But it sounds like a terrible idea.