Disgusting customer service.

I purchased a different brand of dog food because it was the only brand available for puppies on the shelves and as a result the food caused diarrhea and dehydration to my two puppies. And because of this result the dogs started to refuse eating the food. Eventually I decided to take back the food to the store. On my arrival I was asked why I was returning the goods I explained and I was asked for a receipt and I told them I didn't keep the receipt because I didn't think the food will have negative impact to the dogs and I told them that I used the Xtra saving card they can track my purchase and they still insisted that in order for them to give me a refund or exchange I need a receipt. This disagreement went on for 15min and they called the sale manager who didn't have a name tag and he also told me that they can't assist me without a receipt, I told him to take my card and check for the purchase and he arrogantly told me he don't do transactions and walked away without saying what should happen. Eventually I was assisted because what was I going to do with two 6kg of dog food that compromises my dogs health. It is unfortunate that such mistreatments are experienced in township stores and never or hardly in the suburban areas with or without receipts. This must come to an end we all paying with money we work hard for and the least we can get from this store is good service and customer care. And for a change can the Shoprite management in Ebony Park be trained on the rights of the customer. Their attitude is unacceptable.