I have received the same calls on periodically on my cell and work numbers.  This is clearly a scam; after I threat to call the FTC (Federal Trade Commission) the calls stop for awhile.  Several names have been used by a male with a HEAVY foreign accent, by the name of Eric Johnson or John Harris.  The same threat of a law suit and sending the sheriff to my place of work.  Please do not give this or any person your information.  if you have a specific department/unit at your work that handle your telephone service, please it report it to them also, especially if you are in a Government agency.