Where is the incorrect info on OASIS? This presumably was not the reason that you specifically acted in such a way as to fall foul of the law? Why not contact OASIS pointing out their alleged errors to them?
I wonder if the €1,500 Garda fine is in addition to the maximum €1,265 fine that can be levied by the Revenue Commissioners? Or are the Gardai acting as agents of of the Revenue and 'misquoting' the offendant?
The Gardaí don't set fines, they just issue them. Maybe the Garda in question was distracted by blueshoes' jazzy plates (or something) and got his migures fuddled?