Gale, Palisades must give the details of the debt account in writing. They are required to follow the federal laws of validating the debt while attempting collections. Since you don't believe this account to be true, Palisades has to confirm it in writing.
Check out with your local county and see if any legal summons has been filed against you. Most of the CA's issue fake legal papers. Once you are sure about a hearing in the court, go with all your documents to prove the facts. The judge will possibly rule in your favor after the account is found disputed.