Spoilt farmgate milk

Good day, I'm extremely disgustee being the second time now in 6 months that I have purchased a 6 pack farmgate box milk only to open one of them and pour into my tea being thick and spoilt?. I have purchased this brand of milk as it's reasonably priced compared to other brands as I'm unemployed and cannot afford a more expensive brand only to find one of it being spoilt. I haven't opened the rest of 3 X 6 packs that I bought so not sure how many more are spoilt. I had made the purchase from spar phoenix, Durban 2 weeks ago and no I don't have the receipt but paid off my card so perhaps the store can retrace my purchase slip using the date and time of my card swipe transaction. I would appreciate someone getting back to me urgently regarding this matter. Batch number: 1834CA1 Product barcode: ********** 119830/ ********** 119847 Best before date: 06/09/2019 Claudelle pillay