Sold Expired baby formula

I bought baby formula from Clocks baby in Menlyn Shopping Mall on Tuesday the 1st of October 2024, my son took the formula to school on Wednesday, when he came back from school he had been throwing up, he threw up on Thursday, Friday and now it's Saturday (yes we took him to the doctor and we have anti biotics). But for some reason he should be getting better but he isn't, so I decided to trace back what changed between the Tuesday and Wednesday when he got sick, then I remembered I bought milk for him, when I checked the expiry date on the formula I, the formula was expired while it was on the shelve before I bought it, I didn't check it expiry date because you would expect Clicks to be professional and sell baby food that isn't expired. My son is 8 months old and he has food poisoning because of *********** people from Clicks.