My block feature is under the "Initial Settings" menu, and then you scroll to "Call Block" and you can view your list of blocked numbers or add one. It's an older Panasonic, came with a base and 4 handsets. Don't know the model number, but just incase :) Good luck blocking these scammers!
Buy a Panasonic telephone. be sure it has the call blocking option. Subscribe to call display from your telephone company, When you get an unwanted call go through the procedure on your Panasonic telephone to block that call. In the future when that number calls your phone will give one ring then stop. The telephone recognized the call and blocked it. One Panasonsic is all you need to block that call all phones on the same line in our house.