Who are they and are they the really the federal government

Foreign criminals and no they are not the real federal government.

Is these really federal government they trying to get money from me

No, this is an overseas scam. They call preceding to be federal government.

Your answer was given several days before you asked the question.
I guess that means BigA can see into the future.

Let me try a similar task, to look into the future to see if you return to this thread to read the answer ...

Hmm ... no ...