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I work a seasonel job and I got a lay of notice a week ago ever year I leave and go to my winter job but my summer job boss says if I leave I will be let go due to the fact that thay have work for the winter if I leave and get let go I lose my seniority I have been at my summer job going on 8 years and great seniority I don't want to lose
If the company changes the terms of your employment then you don't have to accept it and can walk away claiming constructive dismissal. However, there is no way to force to do what you want and no way to guarantee your position or seniority.