I keep getting calls from them too!!! I finally answered, after their thousandth call, but they just hung up. This is some serious bull and I'm tempted to go postal on them.
This number, 830-255-4348 keeps calling me at odds hours of the day...everyday about a few times a day, early about 8am and late 9pm and a few times in between. Just call ur phone company and block this number.
I have been getting these calls as well. I have been told that the reason no one is on the other line is b/c it is actually a computer calling you and if you pick up they record when you pick up as the best time to call you, so an actually person can call and try to sell you whatever. Also, I've been told that if that is indeed the case, to push the # sign button a bunch of times really fast - this will confuse the computer system and in most cases you will actually not hear from them again (I haven't tried it, but going to next time they call).
good luck!