Im getting the same thing..well just once..If you have an Android Phone you can download an app called, Call control. You can block no ID callers and also numbers that may be calling you all the time.
I also went to USAFIS webpage and applied and got this call same night.
This is a number of the Usafis Organisation @ usafis.org
USAFIS is a specialist in the field of governmental applications in relation to the U.S. Green Card Lottery program.