Complaint Review: american cash advance

I received a call at work from a gentlemen with a thick middle-eastern accent indentifying himself as Eric Watson when I was out to lunch.  My boss gave me the message and I returned the phone call.  The man identified himself again as Eric Watson and proceeded to read me my miranda rights and tell me that a sheriff deputy will be there shortly to pick me up.  I told him that I was not permitted to receive personal calls at work and that I have no clue as to what this pertains to.  He was very rude shouting at me telling me I am going to jail.  My boss overheard the conversation.  She got on the phone and told him we are not allowed to have personal calls and that all correspondence needs to be in writting for the future.  He proceeded to get nasty with her and said he can call this business anytime he wants to.  He proceeded to call back 7 times in 15 minutes.  Each time threatening and screaming.  My boss then decided to call the sheriff fearful that this nut case is some kind of phsychotic stalker/killer.  We recorded several calls.  He had requested that I go to Wal-mart get a prepaid card load it with $500 and call him back with the number.  Never once telling me why I needed to do this or what the complaint was against other than it was a felony.  I am so confused and I feel so violated.  I called home and there are 13 messages from this man on my home phone as well.  I do not know what to do.  If anyone can help please let me know.  I am about to get fired over this.