Mold on food

I purchased dog food on Sunday, i open it up and it has mold, invested with mold! yes i am aware that you just sell products but do you not check them and how long do you keep the stock for? this is disgusting, if i hadnt checked and fed my dogs this food then what?, in december also i purchased a fan and a week later it stopped working, i brought that in and yes you guys told me to wait 21 days of which i have accepted but then go home to moldy dog food ?? no ways!