Keep your sentences short. Use as many memorable examples as possible to illustrate your message. It will be the examples that the audience remembers. Don't expect to win the debate. If you go in determined to win, you will probably lose.
Audiences root for the little guy, the underdog, the person who is polite and reasonable.
Think of this as an opportunity to voice a point of view not as a war to be won. Take the side of the consumer. Not your colleagues. Not your boss. Not your peers.