The business owner could have been upset because the promotion ended up rewarding an established regular customer instead of converting a new client to a regula

The business owner could have been upset because the promotion ended up rewarding an established regular customer instead of converting a new client to a regular. regardless of the reason you were treated unfairly be the account presented. I have had enough promotions and warrantys turn out to be more work than they are worth (usually some escape clause or fine print) that I tend to either let my wife deal with them (I know... let the flaming begin) or just avoid them all together.