im thinking an RK appeal stating there must be an error in the system and see what comes back?
Agreed. Keep the identity of the driver quiet, so you can use PoFA later if needed, but I'd leave PoFA for now. Ocean won't be interested in a PoFA appeal and neither will the IAS, and it just gives them room to distract from your main point, which is that the driver paid for their parking in full.
If they used an app, they ought to be able to get some sort of receipt for this?