Bad taste and smell/sour milk

I purchased 2 six packs of milk at Makro on Sunday 31 May 2020. Production date is 29/01/2020 and the best before date is 29/10/2020.

I opened the first carton and it had a strange smell and tasted similar to blue cheese, so I threw it away. I opened the second carton and it's the same thing, it has a terrible smell and tastes disgusting, quite fermented and sour.

Please advise.