What's to argue about? You're the boss! But, I get it... salespeople need to know what the art department needs; garment, material, all details about the logo being reproduced. The sales people need to understand that the art dept. is not with them during the conversations with the customer, and don't carry any of that knowledge if the sales person doesn't share it with them. It can be smoothed over unless someone refuses to budge for some stupid reason...
Steve