After a little more digging into your case I have found more than just the VAC ban that raises suspicion. On the your IP, only two accounts have ever connected from it, you and this person who tripped SMAC by hacking on Skial.
http://steamcommunity.com/profiles/[U:1:161356411]
It's pretty apparent that this account is a throw-away made for hacking as indicated by its poor hlstats
http://stats.skial.com/stats/hlstats.php?mode=playerinfo&player=5654245, it doesn't have an avatar, it only connected to Skial once before SMAC caught it, and it is set to private. I do appreciate that you cleared up the VAC ban but now we have another issue. Even without the VAC ban I still would be hard pressed to unban you or the IP since there is no information to indicate that you didn't hack on this throw-away account.