We are often harassed by sales people who somehow manage to lay hold of your phone number and persistently try to sell something to you. Once I had a caller who kept pestering me to take a loan from him even though I don't need one. He kept calling me several times. The problem is that we are too nice and too polite to tell them off. How do we deal with such pests? A friend had sent an email detailing Colin Goh's solution to the problem. I have not tried it out yet.