We were at lunch with my wife. Lunch is nothing sp...

We were at lunch with my wife. Lunch is nothing special, but ... We did not get the sweets because it was when we were lunching at 15:10. We came in and we billed boldly before 15:00. Sweetness is supposedly only until 15h. Clearly, the price was not lower. At the lunch menu, nowhere was this rule written, nor did we say it at the time of the order. It's not our dessert, but ...
Unprofessional.