Expired 2 cans of beers inside a 6 pack

<p>Few hours ago I went to pick and pay liquor store kempton park bought an Amstel 6 pack 440ml,got home drenk the first one it was fine went for a second one I noticed it was half and it didn't have pressure on it when I open,went to the fridge to check only to find out 2 of them had the same problem and packaged in the middle of other cans</p>