Selling expired goods

I've never been so disappointed in my life . I purchase biltong which had been expired for more then Seven days . I didn't bother to check the expire date as I had trust in the store , so naturally I grabbed the item and threw it in my trolley to my surprise when I got home it had expired several days ago , what made me check the expire date was the mold on the biltong, it wasn't visible as it was picked in a brown paper bag with just a small opening. That store has a bad reputation for selling expired goods