I'm so disappointed and sickened

I'm so disappointed and sickened. I bought a tray of pork sausages from Shoprite West Street in Durban and when i got home i made the sausages for supper they tasted so horrible those had definitely expired. When i checked the sellby date it was yesterday's date the 17th Jan and these were not even on special so basically i paid full price for horrible sausage i am very upset that i wasted my money and had to throw them away as we couldn't eat them due to the sore smell and taste