Apparently SOUR Ingredients sushi

Purchased R110 worth sushi, for which i have an invoice. UNBELIEVABLY sour taste, as though ingredients were at least 3 or 4 days old. To my mind, it requires URGENT INVESTIGATION into both the cold chain continuity, transport logistics and/or ability to keep freshness of ingredients stable at counter level i.e. basic ability to keep cool or take steps to keep it all fresh at point of prep/sale as case may be? Either way, a very disappointing experience. AS THIS DEALS WITH FOOD / SAFETY / HEALTH DEPARTMENT issues, I demand a complaint reference number and proper feedback, hereto. I seek complete redress for a substandard consumer experience.