Incorrect packaging and incorrect consistency

Good day. I am extremely upset. I bought Nutriday Double Cream Plain yogurt 1kg for my baby who is 7 months old as he is not allowed to eat low fat yogurt. This is supposed to be thick! What I received on opening it is weak, we have purchased double cream yogurt before and this is definitely not it. My concern is that the packaging was mixed and that this is in fact low fat or medium fat. and if so I'm very concerned for my baby, as babies are not allowed to consume any low fat products. I now have to throw away the entire 1kg and go and purchase more yogurt. This was bought on Friday from Knowles Spar in Pinetown and only opened today. Pls advise on this urgently.