portfolio recovery group man claimed to be a leuitenant and threatened to serve me at work and home. the place was using my old married name. lakeview New York

I received a phone call telling me that he was a lieutenant and that he had time sensitive material and that I would be served at work and at home.  Yes I may have a debt to the place they said but they used my last married name with my as number.  I have a situation with identity theft and fraud that the authorities here are dealing with.  I gave them the number to call them and they never get through.  They demanded money so much in 2 wks and the rest by the end of the month.  I have been requesting hard copy of this for the authorities and still haven't received it.    I've not paid anything because I'm still dealing with identity theft and authorities have advised me to receive hard copy. My bank is on high alert and changing everything in my acct to fix any more problems.  I have been alerted that I'm on lists for other possible fraud s.