It is one of the few jobs I have ever done, which I am seriously ashamed of. I did the job (it took two afternoons)of ringing up people to ask if they wished to respond to a brochure, which was trying to sell them space at a trade fair. I only did it as a favour for a friend of my bosses at the language school. I will certainly never do it again. It was quite plainly wasting the time of people, who had more important things to do. Not surprisingly, I did not sell a single bit of space. It should not be legal to waste people's time with unsolicited phone calls like that. It is sheer rudeness.