Long life milk expire date for next year sour

I have one daughter who doesnt want to drink no other ling life milk but Dairybelle. Personally i have other choices however on seeing specials here there and checking expiry dates only to find im sittiing with so many boxes of milk thats off. When they open warm its sour. First few boxes kids threw away now im keeping it all with barcodes dates etc looking at it made the 1 puke 2ce me too became nauseous. First box or 2 i didnt mind but this is pathetic. 4 days in a row i called customer care tokd me c***** took over called there too operators always busy left endless messages . Went via facebook was told vall vustomer again! Till today nobody has returned my calls they wrkvome to send a rep around too as the milk is in a cupboard that does not get sun either this is so ********* and ***********. Im totally annoyed at calling all the time leaving messages too i will kerp these batches as well. I dont know anymore as long life is quite expensive ill never purchase that product again! Plse yoururgent attention would be appreciated.