What legal matters can I take against my job if I feel like my raise was based on personal feelings.........

I am an overnight employee for a Department store... I been with the company since 10/2011. In 3/2012 I received a 2% increase in my pay and was told that it was based only from 10/2012 until 12/31/2012. After that period I became a top performer, I was invited to a Top Performer dinner twice, I was being developed to become a Team Lead for several months, employee of the month for the month of June 2012. I went above and beyond for the job. A Team lead who I feel has personal issues with me was allowed to do the assessment for my pay increase and gave me a 1.5% increase and said that my attendance had a lot to do with it. I am someone who has no write ups or anything on my file about my attendance or my work performance. I receive a verbal warning in 10/2012 for my attendance and that is all. There are employees that have been on their final notice for their attendance and they received 3% or higher.