I once entered a comp to win an adjustable bed. A couple of weeks later I answered a knock at the door, and lo and behold I was told I was one of the people who 'may' have won the bed, and the fellow was there to demonstrate the bed I 'may' have won. Despite me saying I did not want a demonstration he unloaded the bed, carried it into the living room put it all together and then asked me to lie down on it so I could see how it worked and how much I needed it. I could not get rid of him, he ignored it when I asked him to leave several times, and then proceeded to tell me how much it would cost, and how i could pay for it in instalments. He was there for about an hour and a half, and in the end I had to threaten to call the police if he didn't leave. I was really frightened by this time, and felt intimidated. Ever since then i always politely say no to any cold callers, and close the door or terminate the telephone call.
By the way, I refused to lie on the bed.