There's no such thing as an account ban in the game.
Please create your own topic in the technical forums and do the following:
Try verifying game files.
In Steam, right click on the game, select properties, go to local files tab and press verify integrity of game files.
If that doesn't work post your game.log.txt to pastebin.com (no account needed) and then post the link here and we'll have a look for you (split the game.log.txt into multiple pastes if it is too big).
If pastebin is not available in your country please use
http://rentry.co and post the link to it here please. The page works like pastebin.
The file can be found at "C:\Users\*USERNAME*\Documents\American Truck Simulator" for a default install.
The file can be found at "C:\Users\*USERNAME*\Documents\Euro Truck Simulator 2" for a default install.
