Expired goods

Today I went past the Engine at Warwick Avenue(Market Durban) as I was really feeling weak. I got there I bought a packet of sweets, bread and Locazade. I started drinking it on my way to work and when I got to work my tummy started acting up and when I checked the expiry date the item expired more than 3 weeks ago which was 15/10/2018. The lady at the till didn't give me a slip (they hardly do).I'm now at work feeling nauseous,, have been to the bathroom 3 times already as my tummy is running. I usually check the expiry date when ever I buy items there because I have experienced this before. Usually their nutriday Danone. When ever I buy it I have to make sure I check the date.