Why not bring up the matter at the next AGM in front of everyone?
I once had a fine levied on my condo unit for an unpaid fee, it was genuine and 15 years old, but I complained face to face with manager that they never ever informed me about it for 15 years, just let it sit and acquire interest without my knowledge. The management agreed it was unreasonable as I never knew to start with, so waived the fine and I just paid the unpaid fee 15 years later!