I received a robo call stating my business qualified for a loan--I pressed 1 because this is a residence. When the person answered I told him he had a wrong number because this was a residential number--he just disconnected!
When I get these calls I turn off the voice mail and the ringer and let it ring silently forever. Gives me plenty of time to check the number here and decide if it might be a live person I can mess with or just a robot that needs to be hung up on.