Double cream yoghurt so runny

Good day i bought the 6x100g Nutriday Double Cream Plain yoghurt from our local shoprite a few days ago. The next day i took one with to work and because i was so hectic i didn't put it in tbe fridge. Come lunch time i had it and it was watery. I thought argh its hot plus i didn't put it in the fridge. Day 2 im working from home. Come lunch time i have one and its so watery. Double cream yoghurt is supposed to be thick not runny. The big tub 1kg is a better buy and its always thick but because i have to take a certain amount of dairy daily i figured the small one would be great. Big mistake. I regret it so much. Im so disappointed. First time trying a product and this happens.