I keep getting calls throughout the day from this number, so much so that's it now become a nuisance (they are also using 469-640-4072).  No message is being left so that's red flag #1, and when I call back (anonymously of course) I only get a recording that "all agents are currently busy, please leave a message" which is red flag #2.  I'm going to assume this is a debt collector or a prize award company ... either way the number has now been blocked.