I wait, talk to the human, and help them to realize they have the worstest job in the world. Then I add them to my cell phone, but mark the SEND DIRECTLY TO VOICEMAIL box. A few choice words describing her [***] helps too.
Called my cell. "DC, USA." I did not answer, they did not leave message. I have all my phone numbers on the Do Not Call list, so these are particularly irritating.
This is a new number that recently started calling me.
I've had my cell number for almost 10 yrs.
I don't answer calls I don't know so not sure if it's a person or a machine.