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

You should probably have an attorney review everything first. Otherwise, you might get stuck with your prior lawyer's legal fees.

You can accept it or not. You can find out how to keep him quiet.

In my experience this will heal and not be worth suing over. Get medical treatment if required.

There is no way to cash that check after this much time.

Can they be charged? They were charged. That is the answer.

Return it for a refund..........................

Can they have the same PO? They had the same PO. That would seem to answer your question.

I would anticipate their attorney moving to combine the two cases. Then a judge will decide.

There is no mention of discrimination in your facts. You can retain counsel and sue for breach of contract.