You were conned as you say.
This new coke with the green label is marketed as a better option than the full sugar coke but has more calories than the diet one.
Stevia, a natural sweetener derived from a species of plants native to South America, Central America and Mexico, is sweeter than sugar but has no calories. Coca-Cola Life will have about half the calories of regular Coke.
Experts, however, question if soft drinks made with stevia are truly a healthy option for people suffering from obesity and diabetes. Following the Sprite announcement, Dr. Sharon R. Akabas, a director at Columbia University’s Institute of Human Nutrition, told The Huffington Post that she was
concerned by the couching of the stevia-sweetened beverage against the backdrop of Coca-Cola's anti-obesity campaign. "It gives the impression that [drinking stevia Sprite] is a really healthy thing to do," she said, "but it's still ... calories of sugar, which has no nutrients."
Coca-Cola's decision to release a stevia-sweetened cola is especially interesting in light of recent comments by PepsiCo CEO Indra Nooyi.
"Stevia unfortunately does not work well in colas," she said in May.
http://www.huffingtonpost.com/2013/06/28/coca-cola-life_n_3516512.htm