Rotten milk

Rotten milk - we bought 6 full cream milk which was from pick and pay as we always did. This time it was all rotten, sour we opened one after the other in disbelief and we already disposed the slip. I edge all South Africa NOT TO BUY PARMALAT THEY ARE SOUR.... My husband disposed all of them 1 after the other and this milk is very expensive so we lost our 2 weeks milk for my son.