Adutu

Hello, I've did the quest in the wrong order and forgot to steal the keys from Foreman Silixiz, the moment I took contents from the chest I got a 7 days debuff Touch of Zanzil which blocked my stealth ability. I abandoned the quest and now I can't take it again and I'm stuck with the debuff. Is there any way of reassigning the quest 'Mission: Possible But Not Probable' back to my account and getting this debuff off? Thank you