I've received calls from this number for the past six to nine weeks, perhaps longer. I've requested they not call me. I'm on the do not call list and yet the calls continue to come, two or three a day???
Caller ID said "Indiana." Didn't pick up. Caller left a 3-second voicemail, with what sounded like background noise, indicating that maybe it's not a robocaller (or it's a dump robocaller that didn;t figure out it got an answering machine and forwarded the call to a live caller center drone who then just hung up when hearing silence or the tail end of our "leave a message" announcement).
I forgot to add them to my block list... just got a call back... which I naturally didn't answer. They left a 10 second voicemail consisting of "Hello?.... Hello?..... Hello?...." *now* they are on the blocklist.