For general feedback about the game.Steam Support
Visit the support site for any issues you may be having with the game or Steam.
In July of last year we outlined our position on gambling web sites, specifically noting that Valve has no business relationship with these sites. At that time we also began blocking many CSGO gambling accounts. You can view the original post here.
More recently, some gambling web sites started leveraging TF2 items. Today we began the process of blocking TF2 gambling accounts as well. We recommend you don't trade with these sites.