GREENFIELDS MILK WAS SPOILT EVEN BEFORE IT EXPIRED

A few days ago, I bought this Greenfields low fat milk with the expiry date 28 April. When I drank it, to my horror, the milk had already turned bad!

How can this be when it is not supposed to have expired yet.

I hope parents of children who drink milk out of the cartons, taste the milk each time before they give some to their children.