If you noticed that the flavor and aroma of your coffee deteriorate quickly, hold off on faulting the manufacturer and seller for incompetence. Perhaps, it is your fault. So, what is important to keep coffee giving you a pleasure as long as possible?
Once purchased, immediately pour it into a sealed container and keep away from foods with strong smells. Thus you will protect taste and aroma of coffee from their negative influence. For the same reason, do not use flavored detergents for washing the tableware you use for brewing and drinking coffee.