Disappointed with change in portion and recipe

I have been going to Banana Jam for about 16 years. My meal of choice is always the chilli mussel pot starter with extra cuban bread. Over the years I have introduced friends and colleagues to the place and always recommended the chilli mussel pot. Unfortunately last night I was very disappointed with my meal. The portion was half of what it has always been and the recipe seems to have changed. As much as I love the restaurant and the particular dish, if this is the case next time, I will sadly have to move on from supporting Banana Jam any longer.