After collecting 2520 in-game crystals I bought the most "expensive" datacard. Although the label of the datacard said that one character was guaranteed, in fact I did not fat any. I am aware of the justification you give to all the disappointed people who share this scenario, and it is hardly possible to not to notice how absurd it is. I thought the word "guaranteed" has only one literal meaning, and it meant "guaranteed", not the opposite! Liars.