Tub not filled at Baskin Robbins - didnt get money's worth!

So Baskin Robbins is m ultimate favourite ice-cream and despite paying a little extra I will happily spend my hard earned salary on the delicious good quality delight. However, I went to a fancy dinner last week (with the in-laws!) and was incredibly embarrassed by the customer service I received from the Baskin Robbins in Green Point, Mojo Market. I had built up through the night that I bought two tubs of the Famous Baskin Robbins Ice-cream that everyone was really looking forward to. And two tubs is not cheap might I add!! One tub is meant to be 750ml. I opened it up in front of everyone and found that there must have only been 650ml at most! It was about 3cm from the top of the tub!!?? Surely it is meant to be filled right to the top? . It almost looked like I had eaten half of it already. I was so embarrassed!! Please clarify as to why I was short changed?? Please clear this for me as Baskin Robbins is meant to be top quality and is currently leaving a sour taste in my mouth. I did not get my money's worth and am very disappointed.