If there is more than 1000 USD/EUR involved you should get a lawyer to at least help you write the letters. That applies in most countries. You want to do that

If there is more than 1000 USD/EUR involved you should get a lawyer to at least help you write the letters. That applies in most countries. You want to do that because: you want to be considered serious by the other party and not a joke, you don't want to miss deadlines, you don't want to give information to the other side that they can use against you, and you may trigger mistakes from the other side that then can be used against them in front of a judge, if it comes so far. If someone owes you $160k you certainly want to get lawyers involved. There is no question. If your country has mafia instead of a law system, get the mafia involved. If you have a shaman get him involved. For that amount whoever can help you should get involved.