Complaint Review: ACS - Cash Advance USA

I have received several voicemails from a man indicating that I (or my attorney of record) need to call him immediately.  I finally answered a call from him and he advised that his name was Keith McNalty (which I don't believe as he had a very strong middle eastern accent) he told me that I owed money to a pay day loan company but he couldn't tell me the name of the company.  He proceeded to tell me that he could not send me any documents regarding this matter as he did not have them.  He said that he needed me to agree to pay back this loan or charges would be filed against me.  I told him that I refused to pay for something that he said I owed just because he said it.  I told him that I need documentation and without that, I refused to agree to anything.