Trick for spam calls.
Most of the systems that make robo calls out have a voice recognition system that will only connect you to the automated menu or a person if it thinks it's connected to a live person. To defeat it, pick up the phone call and just listen, DO NOT say anything. If the call automatically disconnects in a few seconds, it was a spam caller business and you can block their number. If it stays connected and no one says anything, you can choose to do what you want, but 9 times out of 10 if it's someone calling you (aka a real person, spam or not), they'll eventually say something if you don't.
Source: I used to install and support those automated calling systems. Hated every minute of it.