Believe it or not, this is a perfect time to leave a voice mail. The not answering spam calls I am normalized with, but the refusal to use voice mail for important calls is inexcusable.
I tried many years ago and couldn't figure it out. I've been hoping it will eventually fill up one day so people just can't leave messages anymore, but as I type that out, I realize that's probably highly unlikely to ever happen.
There was a time where spam calls didn't exist? I am pretty sure 2 seconds after Alexander Bell tested the first pair of phones, someone tried to sell him an extended warranty for his car.