I called the number and guy said we are on a recorded line. There were 17 errors on my 2015 and 2016 tax return. Said to get a lawyer so he can fax the documents to them. The irs does not mail out letters. That we owe $4,560.32..after reading these comments he can wait.
(646) 809-9652 number called and left a voicemail that I have "4 serious allegations" being made against me and if I did not call back immediately that legal action would be taken against me.
The number they left was (914) 373-7713.