I was once called by a company to tell me that I'd won a time share. I had a hell of a time persuading them that I had no interest in paying them money every year for as long as I lived at some escalating rate of inflation determined by them. In the end, I had to write them a letter telling them to desist from trying to foist off this albatross on me. Interesting scam, that was...
They never take "no" for an answer.
That's why I usually tell them anatomically what they can do with their offer.