Dog food gone bad

I normally purchase a 20 kg or 25 kg of Optiwoof dog food from my local Vet. I was shocked to hear that Rcl was calling back certain batches of their 25kg Optiwoof product that was apparently despatched during June/July 2025 due to high levels of DON in the said product. My dog,Zack has always been on this feed and has had no physical issues, however, towards the end of July or early August I noticed that he was losing weight rapidly and urinating more frequently and in large volumes. After consulting with my local vet I was advised to take him to a specialist hospital as his blood glucose levels were extremely high ie 26. It was then confirmed that my Zack had become diabetic and would have to be injected twice daily to bring down his sugar levels. I was als informed that this had now become a chronic illness and that he would have to be on it for the rest of his life. After doing some research I discovered that DON does indeed causes diabetes. Why was the announcement of the recall done only in November 2025 and does this company expect customers to keep the packaging for months at a time before disposing of it. I was promised a call back from a company rep but am still waiting.