received two voicemails from this number, asking me to call back regarding to a federal investigation that I was involved in. The caller speaks fluent English with north American accent.

The one I received had such a strong Indian accent I have no idea what's even said... from which I guessed it was illegitimate. They threatened to have the police arrest me immediately

YES IT A SCAMMER  Before them I had the supposed IRS  all to take me to jail,, you would get a mail, registered mail or sheriff at your door if this were true

The "Federal Investigation Department"?? I think he means FBI. "Take it to the courthouse"?? The FBI doesn't say stupid crap like that, maybe "this is J from the FBI. I have a matter I really need to discuss with you. Please return my call asap, as this could have potentially serious legal ramifications for you". Never, "I'll have to take it to the courthouse". I am thinking about calling him back and playing a little game...

Received one voicemail from this number, asking me to call back regarding to a federal investigation that I was involved in. The truth is that I didn't get involved in any cases.