[header] How to make a counterclaim to a creditor lawsuit [title] Read the complaint and summons. [step] The complaint and summons you received has important information about the lawsuit, including the name of the creditor and how much they claim you owe. [substeps] You may not recognize the name of the company that sued you. 
Sometimes a creditor sells the debt to a collection agency that turns around and sues you for the money. If the company that sued you was a collection agency, look through the complaint to see if the original creditor is listed.