Spoiled food at woolworths carnival mall

Today i went to woolworths to purchase mini grocery. I Arrived home, unpacked as i was unpacking my son opened a chicken tikka salad he snacked a little of the salad , i smelt something rotten and, oh! my to my surprise the salad had already expired. I drove back to carnival mall woolworths to return it back, i did not receive any sympathy from management after inconvenienced caused she only asked me if i want my money to be credited back? My response was yes. I then asked her if the staff is not trained 2 check if everything purchased is according to the standard of company the answer i received was yes they are. I did not receive apology on behalf of woolies tge remorse , nothing. I always had a good picture about woolies but 2day that has all changed. I m so puzzeld and shocked of the way the situation was handled in store. Right now i am scared over what my son has consumed that it does not affect him. I checked the salads on shelves at woolworths carnival today are rotten. Urgent attention to this matterappreciated before someone dies or gets sick from food poison. Woolworths i am so dissapointed