Bad Product Supported by Bad Customer Relations

I bought yoghurt the Woolworths brand on the 04/05/2026 from their Threerivers branch. I went home to find that the product was all rotten inside, however not damaged that may have caused this. I have gone to customer Serice online and used other methods, however there is no response from them which tells me their customer Service is as bad as their product. I have pictures that shows the sell by date and actual musty all over the top. The aim is not to blacksmeer the company but the way how they manage customer queries.