Expired fruitree juice

Bought the 5litre fruitree juice at pick n pay hyper by the sea in durban the expiry date on it showed 09/11/2016, however when I tested the juice at home the taste was not the same, I know this cause I always buy the mediterranean flaivor,but this time the taste is not the same, when I drank the juice I felt sick and threw up.all I want to understand is how can a juice be in a box with that expiry date yet the taste is off? How can I ever believe and trust the expiry date on the box if what is inside the box taste horrible.<br> <br> I want urgent attention to this as it is a health hazzard