Who called from 2064456974

They called me, it rang twice, someone picked up then hung up on me.  Called back, press '1' to be taken off the list.

They told me they will give me a 40% off my verizon phone bill and then i checked the number and it wasn't from verizon... Why are they?

I've received a few calls from this number over the past few days on my cell phone.  I pick up and then the phone is ringing, but no one answers, and then they disconnect.   Anyone know what's going on?

The woman caller (extremely) foreign sounding identified herself as representing the US Treasury Dept.She asked for my husband by name. She wanted to give me 7k if I would do this that and the other--. Blah, Blah. She said she needed our address, etc.
Our caller ID said "Service Call".

Did not answer.