This is the second "anonymous" caller that annoys with multiple calls that do not answer when picked up. In the first case I got an answer after being
interrupted five to eight times a day. It was a charity requesting contributions. When I complained about the repeated and useless calls, I was told it is a computer system. I suppose that in the present case it is the same problem: a computer calls with not enough attendants to take the calls.
Verizon can block the offending numbers for $5.00/month. But that does not prevent others to do the same until they too have been blocked.