What strikes me with robocalls that leave messages - they cut off by "talking" too early so I cannot identify who they are, yet if I answer, I get nothing but silence if I answer with "Hello? Hello?" Calm and slowly paced. That's my personal rule. I say hello slowly twice, and if theres silence, I hang up. Dont care if I start to hear a connection as I'm going to hang up. You called me, have someone on the line. My time is worth money to me. I am not amswering the phone to be put on hold for the next representative. Fuck off and call me when you have someone ready to talk to me.

I generally don't answer any number that's not in my contacts. If I don't know who it is they can leave a message or I'll look up the number and block it proactively.