My question involves collection proceedings in the State of: IL

Recently, a collection agency sent someone to my parents' door with what they said was a court summons. They told my father all about my debt problems, including the amount I owe them. They left no paper work with my family and told my father not to worry about it, "they send out these summons all the time, it's no big deal." I checked at the Will County, IL courthouse website and it appears I do in fact have a court date scheduled ten days from now. What should I do? I never officially received a summons. My parents house is listed as my permanent address, but I have been away at school for two years now. Even so, they did not leave the summons there. Am I legally obligated to appear at this court date? Should I call the collection agency? Also, the courthouse lists the reason for my court date as "return date," what does this mean?