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Hello, thank you for the question.
If you belong to a Union, there are only two choices. Either the Union grieves this condition of the employer, or if they won't then you sue the Union for not doing its job standing up for you if you think that there's a chance of succeeding in that that lawsuit.
The union has the sole right and responsibility of representing you as against the employer, under the collective agreement. If they won't represent you (and maybe they think that there's no point in grieving this because they'd lose), then you either accept that or sue the union.
I assume that you've talked to your shop steward or union rep about this?