I’m not a lawyer. The source I provided is generally the best standard you’ll find for this. Collection agencies know their limits because of the law and know not to challenge do not contact clauses. I’m not going to go research the exact cases though.

It’s not generally even needed to get a lawyer at this point. You need a laywer if they breach your dispute claim or reach out to you after you give them a direct “do not contact me.” These have been held up in court but also your dispute claim can fall. It’s just super expensive for them to actually pursue it so they rarely do. I’m just providing the easiest way to avoid paying debt, not a guareneed way like the other person is giving false promises about.

If you’re interested in law there have been cases about contractual changes where you cross out hospital agreements and change them you can look into. Generally changing your contract is honored if its a minor change and hospital staff agrees but if its a big change it wont be held up.