Food poisoning from the fish and chips co in Northgate

Fish and chips co almost cost me my baby. They sold us an expired cool drink then my baby had food poisoning, she was so sick that she didn't even eat or drink her formula. When I complained they said they'll investigate the matter and get back to me but nothing until today, they're even ignoring my calls and messages. I'll never go to a place that sold me a product that expired on the 23 July 2021 and it was only drank by my daughter because she wanted it.