Deva's assassin dagger bug

[Julioscoffee]

Hello. I play with assassin jin and when trying to open the Deva's chest, that i get on Wheel of Fate at scorching sands, the dagger just doesn't come.. IT IS IMPOSSIBLE!!! I have spent all my keys and hongmoon keys, more then 30!! I've got around 6 times of each class, even warlock's one, but never got the assassin's.. I've searching around and found A LOT OF PEOPLE saying the same thing.. NOTE: Other classes can sort the assassin's dagger, but when an assassin opens it, the dagger NEVEERRR comes!! PLEASE, can someone figure it out?? Or at least try to?? I have attatched an image from postimage.org to you see how many weapons i got while trying: http://postimg.org/image/abwic0u8z/ 

[Julioscoffee]

Please, someone help me!! I just can't play like this D:

[Cor]

That's called bad luck not bug. Keep trying or buy brilliant key from cash shop.

[Julioscoffee]

It is some kind of a bug, i am sure! there are a lot of people with the same problem when playing assassin!!! And i have try over 3 days and the same thing happens.. i try 14 more times after take this screenshot and still nothing.. around 35 keys over 4 days and still nothing.. IT'S NOT POSSIBLE!! DDD:

[Seiko]

Si es Posible, También soy Asesino, pero es demasiado difícil :/ puedes intentar hasta 50 veces sin que te salga u.u