Pick n Pay selling spoiled milk

I bought long life 6 pack milk(Pick n Pay) brand Friday the 6th at Tramshed. I’m hardly a milk person and my toddler is the one who takes milk with cereal . I drank the milk yesterday the 8th of December and thought it tasted funny but this morning I made breakfast for my less than 2 year old toddler and I saw thick white stuff and it shows that the milk is spoiled and It explains the funny taste. To say I’m perplexed will be an understatement because already 2 of the 6 pack has been consumed by my child and today I opened the third one and the packaging is misleading since it’s written that it will be fresh until June 2025 and I’m worried about my baby’s health