I also used to get the "Oso May" calls, then blocked them. Just now got the "Vailab U" caller ID at 213-570-9512. I am also on the Do Not Call List and have been for quite some time. They call at least twice a week and never leave a message on answering machine.
4calls this weeek ;when I answer nothing is said but when my wife answered they said it was "Mary" and did we need any construction work done??The do not call list is as effective as the using the cell phone while driving law