Cute n' Fuzzy Bunny said:You should have just told them that your wife was sick and you were distracted by that and the dinner ran long.
What you should have done was let them know that in advance, and tell them to call you on your cell phone if they had any questions that needed to be answered by you. Let the sales shmuck front end it since he's getting the commissions.
I think that's a reasonable suggestion. If your wife was sick enough where you wanted to be home, explain the situation. If they were not understanding of a personal issue, then you certainly have room to be upset with them.