Milk goes off Way before expiration date

This is another company that has absolutely no idea how to help their customers when they have an issue with their product, I've bought the c***** 1 litre from Pick n Pay and three times in a row the milk goes off days before the expiration date, when I try to contact customer service I get asked to send pics to a whatsapp number then I it's all forgotten, their service stinks just like their milk.