Expired goods

I boight 2 yogurt tubs in Menlyn food *****s in Menlyn on 13 June, I am pregnant and opened one to eat 15 June to find the taste funny and realised it expired 9 June. The following day I had diarrhea and went to the shop, the person who assisted me just said sorry and arranged for a refund and asked me to come the next day, I was not able to come in as I was still sick from eating an expired yogurt. Nobody bothered to call to find out why I did not come as they asked