ID says: "Anaheim CA"..... Caller ignored the screener's warning, and said / did nothing as instructed by call blocker. Call, say nothing, ignore the screener's warning, and you get blocked! All scammers and unknown, unspeaking callers get blocked forever! Good riddance!
Keep a whistle by the phone and blow it into the receiver the next time they call as loud as you can. Then report the number to your phone carrier and ask them to block it.