Hello, I am trying to get information to see if I have a good case against a debt collection agency.

Back in 2002 I owed over $2000 to Chase bank. The debt was subsequently sold to Cach debt collections. My case went to court of which I was never summoned to appear by the plaintiff. The principle has a inordinate amount of interest that makes me wary that some chicanery has taken place. Currently my wages are being garnished and it is almost complete. I was informed that I can fight this and possibly get my money back. I never had the chance to dispute this in court. I believe that the company purposely went to court without me so the judge would rule in their favor by default. Do I have a chance to win in court?