I agree with the numbers change, but what happened to respect? What is up with people and the idea that "geeze, I just found his number on the internet and I can feel free to give him a call anytime I like, because I'm a perfect stranger, and what I want is sooo much more important than anything he wants?"
To get rid of these idiots he's pretty much gonna have to chalk it up to a learning experience and get a new number. No matter how hard you ask, the people who do this from the start still won't listen.