Lost ALL reputation with The Oracles

[Caraculo]

I was finishing their quest chain and the last quest seems to be bugged, i have to kill a boss and he became immune and i could not end the quest. But i was ok with not finishing it, but then i realised that my exalted reputation with The Oracles was now honored and all the equip that i bought from them dissapeared..

I lost a lot of time and equipment, i really wanna know if it was my foult somehow, or if its bugged. Also how can i regain my rep or if i'm doomed

Thanks in advance

(I play in Ragnaros, my character name is Strained)

[Anyone0]

That quest is for switching between Oracles and Frenzyheart Tribe. You can go back to the cave later and switch back but you will not be exalted. There are 2 quest givers. 1 for Oracles and 1 for Frenzyheart Tribe.