I got the same call in Massachusetts. He said his name is Harry Johnson (what a coincidence)!
He claimed he is a federal agent and something about taxes and that he will be reporting me to the crime investigators bureau if I didn't comply. He called my family several times looking to speak with me. He did have an accent. I said if it was really the federal gov. they wouldn't be calling me by phone (instead they would send an official letter)+ I do not have any records or outstanding bills so I have nothing to fear! I told him to stop calling or I will be reporting him to the FBI! He ended the call by saying he is forwarding my file within 45 minutes to some criminal offenders bureau.
http://800notes.com/arts/Jb8EW-eDhQA/harassin ... ou-need-to-know
See Residents post here also:
http://800notes.com/forum/ta-34af6a034ba34b6/unending-collection-calls
Templates of Letters:
http://800notes.com/Phone.aspx/1-319-242-7350