The best way to do business with a liar is confront them with the truth. Tell them that you do business as a partner. If your lying customer still can't see the light, tell him that you may not be the best choice for business, and that you think you have someone that can serve him better. Then, refer him to the competitor that you hate the most.
Jeffrey GitomerThe reason you have to say "Trust me" is that you haven't earned it and are forced to ask for it - BAD MOVE.
Jeffrey Gitomer