If you're going to employ a sales trick, at least be creative about it. There are several. Fax an urgent message that their voice mail is broken. Try half of them. I'll bet they work better than anything you're doing now.
Voice mail is here to stay.
Your success will come with a message strategy that has imagination, creativity, and value. Otherwise you will continue to blame the wrong person for your inability to get a call returned. Hello, big mistake. It requires work on your part. Earliest info on new businesses, homeowners Sales Prospecting Center Real info, real opportunities.