What are my rights if I'm doing the work of a supervisor?

Question Details: I'm a contractor for a major computer company and my managers leave early and the staff turns to me and acknowledges me to customers as the supervisor. I don't get paid as a supervisor but the company manipulates its own schedulimg policy so the non-contracter managers leave early and I get stuck with their duties. I have proof this happens. Can I take action in legal terms?

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