I need to do the Garisa Llethri's quests ("Evidence of Corruption" and "Shut the Mines Down"), but seems to be impossible.

Unfortunately, I freed all the slaves in the Caldera Mine, when I started the game. There was nothing that would make me think it was wrong.

And I play on Xbox, so I can't use the console. So? Now I'm completely stuck? I can't finish the Redoran's quests?