Damaged yoghurt

I bought a yoghurt at picknpay today and when I opened it it was all watery, it was running like milk and it had separated. It was a nutriday low fat mixed berry yoghurt 270g. I’m not sure why Danone is selling damaged food, it was so runny I could not eat it, it was not yoghurt at all. I have bought this yoghurt before at the same pickynpay Meadowdale mall but this one has gone wrong somehow.