Bad Milk

I purchased 2 x 2 litres Fair Cape low fat milk from Hout Bay Pick n Pay about a month ago and had to return it because it had curdled. No problem these things happen. But I have just had to throw away 2 more 2 litre bottles of the same which I purchased from Hout Bay Spar. Both time the milk was well within its sell-by period. I've concluded its not the store at fault but Fair Cape milk and I will discontinue using the brand.