I asume you are talking bout the quest: The prisoner of Jathsogur?

There is a known issue with this quest on the consoles: http://forums.elderscrollsonline.com/en/discussion/180746/the-prisoner-of-jathsogur-glitch#latest

The main issue is that spawnrate of a specific foe is too long. The result is that people have to wait to do it. That results in queue's of people waiting for it to spawn, and when it does it is dead so quick only a few got enough hits in.

So yes there is a way of completing it, but it is a lottery. I would suggest following the link thread. Also try to search the forum before creating a new thread. The linked one is also recent and on the main page of this section. I understand that you dont have time to go through dozens of old threads, but the first page is something different

It really helps keeping it clean and that means that devs have it easier to find the prisoner of Jathsogur thread, which also means it can get fixed quicker.