Disgusting milk

This is about the 4th or the 5th time we are having problems with the C***** milk. Each time it is either bitter or off but well within its expiry date. The last batch smelt and tasted like vomit. We have taken the milk back to the shops we bought it from and the managers tells us that they had several customers that have also returned the same milk. I can't keep wasting my money like this. I will never buy the c***** milk again