2YEAR OLD CHILD GOT SICK OF EXPIRED MILK

ON SATURDAY 25/07/15 I WENT TO PICK N PAY WALMER PARK SHOPPING CENTER TO BUY MY GROCERIES AND MY SONS MILK. EVERYTHING WENT WELL AND SERVICE WAS OKAY. YESTERDAY WHEN I WAS AT WORK MY MUM CALLED ME TO TELL ME MY SON WAS SICK I COULD NOT LEAVE WORK BECAUSE I WAS THE ONLY MANAGER ON DUTY MY SON DID NOT WANT TO EAT ANYTHING NOR DID HE DRINK ANYTHING . I THEN FOUND OUT THAT THE MILK I HAD BOUGHT ON SATURDAY FOR MY SON HAD BEEN EXPIRED THE MILK EXPIRY DATE IS ON THE 07/05/15 I MEAN HOW ON EARTH CAN YOU LEAVE MILK ON THE SHELVES FOR THAT LONG ITS NOT MY RESPONSIBILITY TO CHECK ALL ITEMS BEFORE I PURCHASE I MEAN I WAS THEIR ON ONE OF THE BUSIEST DAYS OF A MONTH MY INTENTIONS ARE TO GO IN FAST AND COME OUT FAST.... GUYS MY SON HAD FOOD POISING BECAUSE OF THIS PLEASE CHECK ALL MILK