Repeated calls NOT diverted by a service I subscribe to that intercepts robo-dialed calls (rhymes with SoNoHobo). Callback w/ID blocked leads to reasonable-sounding "All agents are busy; please hold," which gave about two repeats and the third interruption in the music politely asked me to try back later. There was at some point an "offer" to put my number on their DNC list.
Searched for reports about this number on other sites and found one that said they are selling auto warranties. "Protect My Car" is just such a "service" that is also very persistent. About 10 days ago I asked at their web page why they cold-called using seven different numbers (I did not expect an answer), and since then there have been no more calls from that name, but this one, without a name, calls as much as 6 times in a row (again, according to Call Log, since I have the number itself blocked).