Hills Canned food going bad after two days

Good day, We purchased four cans of Hills Digestive dog food after opening the first can and putting it into a container so we can refrigerate it after two days the dogfood has gone bad we thought oke it might have been something else so we used another can and after two days again the food smelled sour. I would like to get a refund on this or a Voucher. Advise how we can resolve. Thank you