That's a tough one, especially as nothing is in your contract about it, one way or another. Also in your e-mails I assume.

The way I see it is you have three choices:

1. Accept it!

2. Ask about acommodation outside the campus. Maybe the school can provide some cash towards your rent, (though my money will be on them saying no to this idea!)

3. Say you find it un-acceptable and put in your notice. Perhaps doing that will spur them into action. You say you were told this would not happen (" However, despite being told to the contrary, the school has arbitrarily imposed a curfew of 9.00pm later reluctantly extended to maybe 10.30pm") so it seems they have broken their word.

They should understand that you are not a student, and foreigners should have freedom out of work hours. If they understand this perhaps they can think about this when hiring teachers in the future.

Are you the first foreigner there? If not, what did the other teachers do?

Good luck!!