I've had 4 calls in less that a week and no messages were left. Just googled this number to find out I'm not the only one. Now that I know it's Comcast (and I do have them for internet service) I just now put them on my phone's reject list.
They just keep calling and calling ... although they have been blocked (3 calls in one day!). What a bunch of annoying jerks! Duh ... do they really think that the magic fairies are going to eventually unblock their number, and that I shall lose my mind and politely answer their call. IDIOTS!