Go onto Google Play on your cell phone and download an app called Mr. Number - its free. Any call that comes in after that you can mark as spam and block it - follow the instructions - its easy!!!! After that, everytime that same number tries to get thru - whammo - it doesn't. it gets hung up on Best thing that ever happened to my cell phone.
They call, let it ring twice, then they hang up. I work for an ambulance, and having my phone go off in the middle of a call is extremely irritating. I have to keep my phone on in case my dispatcher needs to contact me, or if there is a personal emergency. Idiots like these people who have nothing better to do with their lives than to harass people, due to whatever psychological dysfunction is going on in their warped brains, need to be run over several times by the Karma Bus.