I have been asked by the companions to intimidate a guy called Atar in Karthwasten, the guy that is causing trouble in the mine. The thing is i already asked Atar to leave the mine from a quest given to me by the town folk. Now he isnt there anymore, if i show the mission marker it now points to Markarth, inside the inn. When i enter the inn the only thing there is a marker in the floor and no one to talk to!
I have seen many bugs relating to the hired muscle quest online and it seems this a randomly generated quest via the radiant system. All the people i have seen with this bug have already interacted/killed with the person they are asked to intimidate making quest impossible to complete.
I can work around the ps3's many many issues but quest line progression being broken isnt something i can work around

. This means the companion quest line is broken and keeping me from my precious trophy

Has anyone come across this bug and found a solution?
Thanks in advance for any help.