Expired product

I bought 2LT fresh milk in SPAR Standerton in Mpumalanga last week Sunday. In Monday when we were making breakfast we discovered that the milk has expired. I took it back to Spar and they gave me another milk without any problem. But even the one they gave me has also expired, and I discovered that I'm not the only one who was having a problem with that milk. The sad part is that we had to throw away the cornflakes because of the expired milk. I'm hurt because I would normally go to Leandra and buy milk, juice, cheese etc. but now one needs to think twice before buying Dewfresh product again