She says her name is Mary Brown, but I can't even understand her, I don't think that is her real name.  Very asian accent.

Well this number is enrouted through some guys with heavy accent and in background they talk in some foreign language name like Uttham, seedhaarth and they forced me to pay back the month which already paid twice to them through money gram or pay pal which is in name of Patrick Williams. God i don't know from where they got my information and threaten me by saying if I don't pay then FBI will be there in 5 min to arrest me.
Do FBI interested in such cases?

I have already reported this telepphone number to the FBI, FTC, Maine State Police, and the Maine Consumer Credit Protection Bureau.  They all say do not pay them any money, they are a scam.

I got a call from this number at my office..  I never spoke with him, but the funny part to the guys in the office was he said he was from the Federal Investigation Unit and his name was Shawn Wilson, but he could barely speak English...  I am sure it is a bill collector of some sort but why do they have to try and sound like they are police, just be real with me and I will talk to you!! sheeshhhh

I agree. I got the same call, but it was a woman named Mary Brown and she could barely speak English. These people are getting more and more ridiculous.