Dh is a senior manager. He was called into a meeting at 2.30 on Friday afternoon and told that there is a big reorganisation and now, instead of doing x, he has to do y. Basically half his clients are being taken away and he is being given more - a lot more, so he will have 2 or 3 times as many clients as now. No salary rise to compensate. Plus he has to join a new team and will be the only non-native person on the team ( the employer is foreign-based and although dh speaks a little bit of the language, he would find it hard to do business in it).
Dh was so shell-shocked he just said "do I have a choice?" And his boss said no.
Then at 4.30 they called a meeting of the whole department, and announced that the restructuring would be taking place and dh was introduced with his new job title.
What can dh do? I know in theory an employer can't just change your job, but in real life, what can you do?