Waterry liquid floating on my yoghut

On Monday the 10th of June I bought 2 x 1kg C***** Bliss plain Yoghurt at Checkers at The Reef Mall in Germiston. To my surprise when opened them they were very watery liquid floating and it looks a bit offish as its not even white, then I checked BB is the 19th of this month. I am so disappointed at that particular checkers on why do they keep stuff that are left with only a week on the shelf. I frequent that checkers hence the disappointment.