You can personally contact EvenBalance, click http://www.pbbans.com/mbi-viewban-d3bd5595-vb216713.html and follow the appeal this ban button instructions.
However, I don't think you quite comprehend how this process works... the only instance in which we'd lift the ban is if EvenBalance tells us AIMBOT #50120 is an invalid violation (false positive). This would mean us lifting bans for 2,171 players, who play BFBC2, for a violation which they've stuck by and said is positive -- just can't see it happening.