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You agree to work for them, they agree to pay you. If you are not happy - leave.
If you can't leave - try to survive somehow but you'll have to sacrifice something. To make it psychologically easier you can play some retaliation games on your employer, like trying to find holes in the rules, or using sites like keeplookingbusy.com to get some fresh air.
Anyway, it's your choice, as much as your employer chooses what kind of people they need for the company - they'll get what they asked for.