You need to go straight down to your local court house and look up the case against you. Get copies of any paperwork there that you have not seen. It is especially important to get a copy of the alleged "proof of service"-- the document filed with the court stating you were legally served. Examine it to see if it is accurate-- that is that the address is correct and whether you got the papers in the manner they claim. I am seeing many incidents of false service,(also called "sewer service")...