United Federal Investigative Company Frank Miller, James Davis I am going to be arrested if not paid, California

Ok, let see where do I start, ok back in January 2009 I received an phone call at work from a gentleman named Frank Miller with United Federal Investigative Company Phone Number 951-200-3254 (Which no longer belongs to him) stating that (A payday loan from Money and More in July 2008) this was not paid (returned from my bank) and if I did not pay immediately that he would have to process with legal action and have me arrested (in the conversation he advised me not to leave town) and I will lose my job.  He also stated that his team would show up at my door with documation and have an suponena with 2 days.  I found the documntation and called him back with it, but he stated that his team has already processed the paperwork.  Now today October 10, 2009 I received a call from an James Davis (I swear it is the same guy) asking for my attorney information.  I told him this was taken care of, and as stated above the same information came out and this time, when I go to work Monday I would be arrested.  First of all this type of debit does not call for someone being arrested.  And Second I received an email from the company I took the payday loan out of and they stated it was paid in full.  If any one has had this guy or the same situation let me know I would appreciate it.