What did you mean? If there was no bounty from their side, why tranthidung launched the campaign and who have paid tranthidung some cash? Can you relate this? I think there's a misunderstanding between you and the team member you have PMed.
Did you try to contact tranthidung through PM? What did he say? I think it's good to discuss with him rather than posting here. Project owner wants great promotion in return of shit tokens and when they don't get enough of the targeted result, they deny paying hunters. Though it's good to escrow the rewards, not every project allow that.