Bad service

I purchased two trays of 100g yoghurts from Shoprite Charlsville, and my four-year-old son has been consuming them since Sunday, 11th of October. I recently opened one of the yoghurts last nights and noticed green Mould spots on it. The expiry date listed on the product is 04.11.2025. The fact that my child has been eating this yoghurt, which contains Mould, is concerning. No emails or customer service responses were provided.