elseif $(nick($chan,$nick,oh)) {  <-- ($nick($chan,$nick,oh)) ?

has a missing bracket
}
}
on :unban:#:{
if $bnick { .notice $bnick You have been unbanned from $chan }
}
} <-- it needs to be:
on :UNBAN:#:(notice space here, better for the mirc. ;)) {
if ($bnick) { .notice $bnick You have been unbanned from $chan }
}
Also, I don\'t see why it would work at all, missing brackets...
Where does $bnick come from? i don\'t see an alias with return.....