I do hope that's true...

Sometimes, I usually don't have the time needed to complete a mission so I just complete some the day before and collect it the next day. That is why I was dumb enough to not collect the reward and I don't have a screenshot...so I suppose I'm going to have to learn from this lesson, but anyways, to all who took the time to read my problem and tried to help me thank you a lot, I appreciate it.

Yesterday, I completed my Halloween mission (earn 3000 experience for 6500 crystals because I am major), but I didn't collect the reward and today when I came on to collect it (in vlog, it was stated missions could be completed and collected the next day so you don't have to play to have mission chain), it was gone. I was wondering if tanki can give the crystals if you missed it so yeah, please reply and see if you can do anything about it. Tank you!