well, i'd save the demo ande make an unban request (in the unban request section). follow the correct format and attatch the demo and a link to this thread. that way zero will know to look into it.
edit: although, the one kill at 9200 ticks (viewing demo through demoui) was pretty bullshit. i slowed it down to 35% speed and there is no way that was either the single most lucky shot ever made, or it wasn't legit. the guy was a full 20 degrees to the right of the crosshairs, close range (aka bullets wouldn't spread that far) and it was a headshot.
see for yourselves.