A default judgment happens when you don't answer, appear, or timely provide a response to a discovery demand. A plaintiff can enter a default judgment against you if you fail to answer a complaint within 20 days. First, the plaintiff must prove that you received a copy or knew about the lawsuit, and that you were not in the military.
Typically within a year or less you must file a motion asking the court to reopen your case. A motion can basically be a letter with a caption that spells out what you want the court to do. You must provide the court with a good reason; for example, you never received a copy of the complaint or that you were out of state. In Wisconsin it is very difficult to reopen a case for failing to answer. Even being one day late can be a challenge so it is important to acts soon you find out.
If your lucky enough to get a hearing you must be able to prove your case. Bring photocopies of any documents that prove your story.