I too am sick of this and other robo-callers. I listed my business number on the national do not call registry and they STILL call from this and many other numbers. I'd like to answer and tell them I am on the do not call list, but then I'd have to endure waiting on an actual person to answer and listen to a bunch of pre-recorded garbage and I don't have time for it.
I recently started just answering it and immediately hanging up, but I am unsure if that's only making things worse because it will show I answered the call at some point on their records. Whomever invented robo-dialing is an idiot because I CAN NOT IMAGINE anyone would actually wait on someone to come on the line and then listen to a boring and canned sales pitch, let alone buy anything.
I just got a call from this number. No message left. I have come up with several ways to deal with these annoying calls. Since they usually come to my cell phone, I first create a contact name for each phone number which says "Do Not Answer - Telemarketer." Then I attach one of two ringtones which I downloaded from the Apple store (but you can probably get them elsewhere.) The first is a "silent ringtone." That's right. If they ever call from that number again, I will never even hear the call. It just comes up later as "Call missed" with "Do Not Answer-Telemarketer."
The other ringtone, which I sometimes assign to these numbers, sounds like a phone company message with the words "We're sorry. The person calling is an idiot. Please check the number and let it go to voicemail."
Now, instead of annoying me, these callers at least make me laugh. Ha!