Can I sue my employer for paying me less than the job description states? Do I have a case?

I have been employed for 2 yrs and was hired on to a position where they told me my paygrade was a 6. 2yrs later I have found that it is actually a 7. I noticed in the job description in the paperwork that the job I was doing was a 7. I work really hard and have gotten excellent yearly work reviews and they have... show more I have been employed for 2 yrs and was hired on to a position where they told me my paygrade was a 6. 2yrs later I have found that it is actually a 7. I noticed in the job description in the paperwork that the job I was doing was a 7. I work really hard and have gotten excellent yearly work reviews and they have cheated me out of almost $2,000. Not to mention I would be getting paid a lot more at this point. What should I do. Any Professional advice would be greatly appreciated.
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