the ignorance of the system is no excuse, if they impound your car or charge you falsely its just something you are supposed to laugh about and not get upset over
all this for one wrong key stroke and now you have to wonder if this lawbreaker will make a habit of getting in trouble and will you get mixed up in it again because of it.
if I were you and knew someone else had my number like that I would get a new plate to avoid more mix ups in the future