Anna University — regarding revaluation paper

Address:

Chennai, Tamil Nadu

Dear sir/madam,
We have requested to get the copy of paper and applied for revaluation. After we got the paper, we realized that first page is ours but inside the answer sheet is another student. So we have complaint and evaluate my original paper. But result announced no change. So what we can do? Is it any solution or approach anybody? How to approach this case? Is it contact any higher official in anna university? Many students affect this kind of issue. Actually we have applied 2 papers. One is cleared. Another this paper is still nc. But the answer sheet is not mine.