I used to work for Customer Relations for Mitsubishi here in Adelaide at head office.
I can tell you right now Japan wouldn't care.
For example Mits Motor Corp is different from Mits Motors Aus Ltd.
We would get all kinda of complaint with this and that being threatened and basically at the end of the day MMAL supplies cars to the dealers who are a franchise, and we didn't get invloved of the day to day running of a dealership.
End of the day, don't like it speak to that dealership, thats all we would say, unless otherwise.
Same would go most likely in this situation