You need to be completely sure on what debt they are taking you to court for. Bring the wrong information is not going to help you.
I would call them and ask for account information. Be sure to write it all down and don't forget to get their mailing address.
If the account, or any account for that matter, had been paid or previously settled you need to get a zero balance letter. It will state that the account has been settled or paid in full.