Show up in court. If the debt is yours but is so old that it no longer shows on your credit report then the statute of limitations has expired. The plantiff is probably trying to get a summary judgement based on you not showing up to object based on a statue of limitations (or other) claim. If it is not your debt you need to say that to the judge. Not showing up means the other side automatically wins and they can get a judgement against you that will show up on your credit report.

