I see no reason that NCAT could possibly award the opaque, unresponsive and secretive OC a farthing, let alone what they insinuate they will seek.
If the OC can show that you have no case, and that you knew you had no case but, for instance, merely held a grudge because of behaviour you found unacceptable, that could turn out to be quite a lot of farthings in your debit column. You need to be very sure of your grounds before they “lawyer up” and those billable hours start adding up to your disadvantage. Talk to a lawyer.