Being sued by yellow pages. 2005 ad last a year? I was served last month. I had 20 days to reply or, default I

should have let it default. I told them i did not place the ad. I am on ssi since July of 2006. I have a incurable disease, and I'm sixty one years old. The ad was placed by phone, and a voice was used as a signature. The last name was not my name, the phone number for the ad was not my phone number. Now the lawyers sent me a 20 page order to supply all information about my ssi and hep c diagnosis. What do I do? I can't afford a layer. I have 30 days. The lawyers also had a copy of my lease from the apt. complex i live in as exhibit A. I've lived here since 2002 Why do they have my lease as exhibit a?