Poor Management/ Small food portions

Went for lunch at Primi Piatti in Saturday 2018-06-09. Ordered a Bolonaise and my girlfriend ordered the Carbonara. When the meals arrived it was clear that mine was a way smaller portion than hers. She even commented out of concern that it doesn't seem like it would fill me. Called the waiter over and showed him the difference in portion size. He discussed this matter with a manager and returned saying, and this was what angered me the most, " its because of the ingredients that the portions appeared different in size" *** ?! Said that his manager reckons if im not full after finishing my kiddies portion meal, I could get some more if I'd like. These two guys clearly treated me like an idiot and felt that they should make me look like an unhappy baby over food in their establishment. This kinda treatment after I go there often driving all the way from the Northen suburbs to the Waterfront. I was ****ed at this treatment and needless to say I finished my meal long before my girlfriend did. Still had to order a beer to drink while she ate her lunch. Gave a R26 tip to the waiter afterwards coz I thought it fair for the 10% of my bill. However, I doubt that branch would ever see me again.