Silk Worm infested puppy food.

I purchased a bag of Puppy food and kept it stored in a clean plastic tub that is always sealed, yesterday I noticed worms throughout the food, there is no way the contamination happened in my house so it must be a bad batch from your factory, I am horrified that my puppy has been eating that and now I had to spend more money on a replacement bag. I have been a loyal customer for many years with my other dog but this is making me wonder if I need to change them both. I have pictures of the worms all wiggling around in the tub!!