Can my employer switch me from full-time to part-time without first notifying me?

Question Details: I went to use my paid time off as I've been working full-time for over a year, however human resources told me that I was switched to part-time a long time ago and that I had no paid time off. Nobody told me and I've continued working 40 or more hours per week. I was given a benefit packet when I was moved to full-time. And human resources was also unable to tell me the date I was put down to part-time. What can I do?

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