Rosauers Supermarkets review: Flat coca-cola product

I purchase Coca-Cola in the can at Rosauers in Libby Montana. The product is flat . They aren't keeping it stored properly. It tastes like its been cold, hot, cold . I pay anywhere between 6.00-9.00 a case and the product itself has been subpar. I have enjoyed Coca-Cola my entire life . I have purchased in many different places all over the USA & Canada. This store is awful I have brought this to the attention of managers with no fix to the issue. Thanks in advance for your assistance.