Rotten Milk

Mid Dec 2017 i bought one of Orange Grove UHT 6 Pack milk at Pick'n'Pay Berea Durban, which i began using it Monday this week, i opened the Milk and the lid top had a white thing that clearly indicates that the milk is off so i decided to smell it only to my surprise the milk was off and i said to myself mybe its just this one pack that had a problem i opened another one and guess what even the other one was off yet the Best Before date is 07-07-18 , I'm so disappointed in you guys i thought you aalways check your product before it is proccessed how on earth did this happen.... all my money is gone and for what? rotten milk like seriously...? I'm so angry and disappointed ....