You should have the document reviewed by an attorney.

To get the best responses, consider reposting your question with a question and more details.

Ask for the papers, check the court records, and look into a motion to set aside the judgment for failure to lawfully serve the lawsuit.

It sounds as if you have a defense to any lawsuit, that they have been fully paid. You might also have a case against them. Consult with...

Many cities or counties have legal aid or other organizations that provide pro bono (free) legal advice and services, including bankruptcy.

You will simply show your proof on trial. Note, You must respond in the legal way and on time with, for example a motion or an answer with...

No, that asset is not subject to levy.

It is likely to be difficult of that other loan is still in default.

They can sue, get a judgment, and domesticate the judgment in the state where the property is located. While they can put a lien on the property,...

Check the loan documents for your rights to repossession.