no message left. caller id "unknown"

No message left.  Am on the do not call list and still get these calls.

I am also on the do not call list, they did not leave a message either

I have received a call or two every week for about a month now from a number like this or close. It is an automated woman talking about senior citizens falling. I have listened to the whole thing to get a person to talk to, however, nobody comes on. I am on the do not call list as well... I am getting really annoyed! Nothing I can do to stop it.

I have received calls from this number at least 3 times (10/3@9:16am, 9/26@1pm, 8/28@9:43am). No messages and when I call back, Verizon says the number is not in service. Wish I could stop these unwanted calls.