There were players who kept making tickets, about every topic, even things Blizzard told them they can’t help with or in “panic” created dozens of them of the same subject and then complained it takes very long for Blizzard to react… While they were part of the problem.
So Blizzard limited ticket creations. As Poisonenvy suggested you can drop the guild ticket because that is a known issue and CS doesn’t work on bugs, there is an official statement here about it already. As for the quest, it depends, but they can likely not help. I recommend checking out WoWhead as sometimes there are workarounds in comments there.
For the refund, you can only successfully refund products you’ve not used at all yet, within 14 days of purchase. You can still ask for this though.