If your prospects won’t return your calls, it’s because we aren’t giving them a sufficient reason to do so. People always do what they think is most important. If they don’t call us, it’s because we aren’t registering on their priority list. So ask yourself: if it were me on the other end, what would compel me to call me? If you can’t answer that, go ask some of your clients (after all they did call you back); maybe they can give you some ideas.