Harassing calls

They keep calling me that some Mathews guy came to visit me but I was not there. That my door was locked so now I don't have the opportunity to clear this issue and a court date will be scheduled. I will not have the chance to settle this out of court and need to pay the monies owed $300 payday loan I borrowed in 2010. Omg I was shaking and so nervous. He mentioned three lawsuits and federal credit and bank and financial report. I pretty much lost it and he hasn't called back yet. I do not know what to do or who to report this to. Please someone help!