Those in call centres
People who like cold calling (and there are some) love the adrenaline rush of getting one over someone. They love the victory of your defeat. There is no empathetic side to them. Psychopaths? An easy word for someone who likes quick wins, has shallow emotions, wants thrills. I assume the person on the other end is one of these and so nothing I can say will do anything but trigger their rage at being thwarted. I know my solemn duty is to keep them on the line for a long time, but I usually can't bear it.