Happened to me too

Time: 12/17/13
Frequency: Once T_T
World name: Midgardsorner
Character name: Noice Spoice
Class/Level: Bard/50
Party or solo: Solo
In-game time: After patch 2.1, A realm Reglitched.
Area and coordinates:
Steps:
1. On last step of Relic Reborn (Artimis bow), Purchasing oil
2. Was on my 50 monk, bought the oil, and switched to bard to turn it in, the quest log currently said "Completed" and showed me having 1/1 oil
3. I go to the blacksmith, above his head it is still a red quest turn in, and he says that i do not have the sufficient items yadda yadda yadda, all while still showing my inventory with the oil, and the quest actually saying 1/1.
4. Logging in and out proved to do nothing, and now the quest is actually gone like it was abandoned, and i have no progress what so ever.

On...the...last....step.....made me so sad im contemplating taking a break from this game due to terrible customer support thus far, I still have an item restore that they said they would take care of but its been 2 months and still no word. but thats another story. Its a shame, I love this game so much