I have bought a few 7up's without any carbon dioxide and I'm really not happy about it and I can't go back to the store to get a refund which I very inconvenient

I have bought a few 7up's without any carbon dioxide and I'm really not happy about it and I can't go back to the store to get a refund which I very inconvenient. This is also false advertising and I will like it feature if nothing is being done about it !