Called them back with Caller ID off. They don't even say who the are. Instead:
"Press 1 to learn more about our services." "Press 2 to have your number removed." My favorite, though is "Press 4 to connect with the authorities that regulate our industries."
Received a call just now and I didn't answer. They left no message and calling them back I received a Press 1, 2, 3, etc.. Pressed 1 to talk with a representative but they wouldn't give me any info about why they were calling.