I get about two calls a day from this number, they never leave a message.
However, today they did- and it was purely accidental. I got to listen to them make a few more calls.
Caller identified himself as 'Ronnie' from 'US Grant Department'
when the receiver said "I'm not interested" and hung up, 'Ronnie' replied with "you're not interested? then get lost, don't waste my time."
Truly a classy operation.