Courts can’t find the homeowner and I am tenant

Hello. I am a tenant renting a home. I started receiving letters from the courts saying the mortgage had not been paid since the date I moved in. The letters also state they are unable to locate or contact the landlord, however, when I send the letters to the leasing company who we go through (we have never had correspondence with the landlord, everything has been done through the leasing company), they say they have spoken to the landlord and she is handling it. Now I am receiving letters that they are filing a motion for judicial default and my husband and I (the tenants who rent) are listed along with the landlord as defendants and that we have failed to reply in a timely manner. What do I need to do as the tenant?