STOP TRYING TO CALL THEM. Send a short email. Meet them at a conference. Connect with a decision-maker who reports to them.

Don't get hung up trying to speak with the guy at the top. Chances are, he's not going to blindly purchase from you anyways.

Get smart about representing your product and connecting with the right people -- and make sure you deliver value that matters to the dude on the other end of the deal. OK?