food poisoning

I have been a regular at this branch for many years but since new ownership, service has deteriorated gradually over the months. Used to have a regular person that made our sushi but she left shortly after the new ownership. Lately we have had several incidents of stomach issues when we eat here and this never used to be the case before. Yesterday's experience was by far the worst as I had severe stomach cramps and upset tummy throughout today and had to miss work. As this is not the first time i have had tummy issues I think that there is either food hygiene or food storage issues since the new owners have taken over. I have eaten at CTFMs in durban and have not had similar issues and have eaten sushi from other places in johannesburg without the same issues so I am certain that it is definitely something at the branch itself. Would like the franchise to investigate and respond.