Recorded message (made with pauses built in to sound like a real person who says "Hello" and "I can't hear you"). Something about "you will receive 2 free programs in the mail and a free $100 shopping gift card."
National Co is what is present on caller ID. Never anyone on the other end of the call, just white noise. Called the number back and got a fast busy signal. This company is calling our organization daily, and they always make two calls in quick succession. They sometimes call us more than once per day.