Restaurant work: day off

I have a doctor appointment today, so I told my boss weeks ago I needed this day off. My boss chose to elect teenagers as shift leads, and they said I didn’t give them the day off and they make schedules that I HAVE to come in or will be written up. Advice?? Also, they keep cutting my shifts and give themselves 5-6 days while everyone else gets 2-4. The shift leads are lazy on shift and don’t do anything making us work double while they get paid more

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