Thanks for your message. I merge it to this topic.
We are still working on the quests issue, we seriously care about it, but it can't be fixed in a short time as we need to do more tests and dev and perhaps also a new release for that. I hope you could understand.
I also do some tests on my side, the issue looks related to specific campaigns and quests. Did you try to play another one to validate your quests please? Like it was previously suggested by Windblaze for example?
Furthermore, in order to reproduce it, could you please give us more details? What are the quests stuck on your account? And what campaign / raid did you play ?
The quests are not linked to our in game store, you do not have to spend gems to validate a quest.
I understand that you could be frustrated because of that, and we are really sorry for this inconvenience. As soon as I have also more information on my side, I will get back to you here.
Thanks for your understanding, I look forward to hearing from you.