Last century, I worked for a magazine sales company that did telephone soliciting. We loved it when people slammed down the phone because it meant no wasted time. The worst was when someone wanted to chat. One time a kid answered the phone and I asked for the dad. She said, "He's out in the garage under the car" and ran off to fetch him. It was a dillemma what to do next. Hang up? wait?. Another time the person on the other end kept repeating only the word yes during my sales pitch and then 5 minutes in switched to "can you please speak chinese". Even when I said "goodbye".
These days, I tell them I'm really glad they called and I need to move to the phone by the computer so I can purchase what they are selling. Then I set the phone down and go about what I was doing.