I did this quest many months ago where I had to dig ancient iron coins in the Velancia Desert. I then handed the quest in and completed it. After I quit for a couple of months and returned, it said I had an unaccepted quest in that quest chain called Clean Revenge. The requirement was that I completed the previous quest in the chain. However, when I go to the NPC, I cannot accept the quest. I also cannot drop the quest or any of the quests in the chain to do it over again. When I press O and find the quest in the menu, I clicked the red arrow button pertaining to the quest: When I click that button, the only thing that happens is the Black Spirit appears with no options of a quest to pursue.