Scam?

Last December I got a call from a man named Walter Sweet. He said he was with Rephen Law Firm out of New York. He went on to say his firm had a check that bounced three years earlier. He could not tell me the amount or to whom it was written, nor the bank I wrote it from. It was all so wierd. Then he told me he would only take a money gram from Wal-Mart. That is when I decided NO WAY was I sending anything. He got nasty and said they would take legal action if I did not send it right away. I never did and have not heard from them since. They are a scam.....right?