My caller ID says Florida and 321-740-9999. It's a recorded message "alert" about my credit card trying to get me to lower the interest rate. The voice gives you the option to press 3 to no longer receive calls, and when I push 3, it hangs up. But they keep calling.
Just got a few missed calls from this number as well. No idea who it is, but when I call back, it tells me that the number or code I dialed is wrong and to check the number and try again.