Been on my blocked list forever. I'm surprised they even leave messages. Stupid scams. I was in the middle of a riveting game of Bejeweled and they disrupted my gaming. I put a curse on them.
No one can stop them because there are too many of them and they switch phone numbers often. Only way to stop them calling your cell phone is one by one. When anyone like this calls me I save their number in my contacts under Scam or Spam. While still on that new contact I choose "add to auto reject list" (on my last phone it was "automatically send to voice mail") and hit save or done. I never hear from that phone number again.
Arrggghhh!!! I block these types of numbers and they come up with a new one! They call and then leave a half message '....to discontinue further services have a great day'. I blocked yet another number today. Why can't someone stop them????