CASH ADVANCE USA I received a phone call saying they were from a law firm and that I owe Advance Cash USA more than $500 for a loan. but they I checked all my bank statements and could not find it. They said I woul Internet

On June 14, 2010 I received a phone call from a law firm saying they were collecting a debt from CASH ADVANCE USA, for more than $500.00.  They would not give me any information, not even the date of this transaction  If I owed the money I'd pay it, but I don't recall receiving the money, and it did not appear on any bank statements.  Although they had all of my information.  They told me I had to pay it by 5PM the same day or I would need to hire an attorney and that would cost me $5000 or more.  I could barely understand the gentleman who called and there was much noise in the background.  To say the leat they were not very professional.