Who called from 3603471790

I just got the same message... after reading all the recent posts on this number, I am sure it's a scam.

Called my tax client saying they were filing lawsuit. I called back from a secure phone...got immediate busy.

Ignore it. I got the same. Do not return the call.

Also received a call about a final notice from the IRS suing me. If there are this many comments about this number, how has it not been shut down?

I just received the same call, but it was on my voicemail.  Im not past due with anybody at all.  I called it back and I get a busy signal every time.