Thats a bumer, that they woudnt be helpful.
We should see if my Pioneer are more helpfull.
If you should see an 9 digit number apear on the screen write it up.
Hopefully you will not have to set the ID Data again.
Edit:
I've just spoken to Pioneer,
If you have the Service Remote you will be able to get in to the service menu and restore the region setting. This should make your player fully functional again.