Thread:Wei96/@comment-22439-20150916173501/@comment-26044650-20150916181730

You are only garaunteed 3 S rank treasures IF you buy the 6+1 Big Set. If you buy Supreme Treasure Chests only, you're not garaunteed S rank treasures at all. So if you want to get S rank treasures, it's a good idea to open the 6+1 Big Set as you will always be garaunteed at least 3.

Opening Supreme and 6+1 Big Sets has an increased chance of giving you S rank treasures (or more than 3 if you open the 6+1 Big Sets) if you open them during the Better Chances of Getting S-grade Treasure event, but again, it is not garaunteed.

Complaining to DevSisters will not do anything anyway. They won't refund your Crystals because you didn't read carefully. :/ At least you know what to do for next time to avoid this problem again.