Owner denying food poisoning claim

In 2022, a function was hosted at this restaurant, in which no alcohol was served. The next day, I spoke to my friends and there was a general consensus that everyone felt sick later that evening and in the morning. As somebody with a serious autoimmune, this was a major set back for me and could have landed me in hospital. The owner denied any claim that there was contamination and proceeded to gaslight us by saying we consumed too much alcohol. Alcohol does not cause a runny stomach and a fever. At the end of the day, the owner claiming that we drank too much alcohol is a serious allegation as many people drove themselves there and could not have possibly got behind the wheel while drunk. At the end of the day, only the chefs know what happened in the kitchen. The owner claimed that a small handful of people ate takeaway beforehand, which had nothing to do with food poisoning. I have a team of lawyers and am protected by the Consumer Protection Act. We have the right to food safety.