It was my understanding if costs are awarded there is a specific process to arrive at the correct amount. Does not sound to me like this process has happened. Did they put in a submission on costs ? If they did, you would have seen it. It would have been sent to you. Then the Tribunal decides if costs are awarded. You would have also received a letter from the tribunal saying whether costs were awarded or both parties bear their own costs. If the letter regarding cost did not come from the Tribunal I would have a high index of suspicion. I think Jimmy is right. Good luck.