Who called from 2024951371

I was called by a man from 203.549.8620 claiming I had been selected for a Government Grant so I listened & the next stage was to call the number 202.549.1371...The man here has a nasty attitude & mouth !!!
The first man had all my personal information so I wanted to figure out how he got it...but he was careful...he said his location was
200 Independence SW Ave.
Triple H Bldg.
Washington, DC 20201

Is this a scam?

They told me they was weastern union it to me .all I had to do is pay 270 dollars and I would receive it in 30 min

They told me $99

Why are these people not arrested.they gave thlar phone no.