stepping up of pay

Sir
I was promoted in the erstwhile grade of 5500/9000 as TTI in the year 2001 July and my junior who refused promotion and got promoted in the year 2003 to the same grade in the month of Nov and he opted for pay fixation and was given pay fixation at 6900 in the month of April wheras we got 6900 in July ,as I was promoted and served at a different checking depot I got to know about it in 2012 and made a representation of the same.Am I eligible for stepping up of ad there is difference of 420 rs in our basic

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