This is a general Q&A forum, not a law firm.

This is a Q&A forum. You have not asked a question.

The practical solution is to send them money orders. Quicker and cheaper than hiring a lawyer.

That individual will not be eligible for enlistment.

This is not defamation, so the answer to your posted question is no.

You need to find another doctor. This is a medical issue, not a legal issue.

HIPPA doesn't apply to private parties.

You have no grounds for a lawsuit. You owe them the money.

There are no grounds for a lawsuit here.............

Which gets you nothing. You now know about the lawsuit. Hire a lawyer to defend it.