Spiled food!!

Even after reporting that the food I bought was spoiled and I got a stomach bug due to that they simply called to apologize and told me they will check their refrigerators settings... So does that mean I spent my hard earned money on food I could not eat for them so simply say sorry? Do you know how serious food poisoning can be? Can I please get my money back! I received an email stating that the case is closed... How is it closed without any investigation? Without me getting my money back? The manager who called me never even bothered to replace the meal! Is this how you treat your customers?