Carsten, that is frightening, it's bad enough that we put up with a bevel box that sounds as if it is full of loose nuts, but if it actually is, and seizes it is certainly not acceptable. Were there any warning signs before it seized?
If it was me, I would be writing direct to the Managing Director, Mr. Morris I believe, with a copy to your local dealer, and whilst writing, please ask him what the company intends to do about the bump steer.
Welcome to TM, I'm only sorry your first post carries such bad and frightening news.