This is a wonderful example about how helpful Steam Support actually is.
WARNING: There's a lot to read. But it's funny\sad at the same time. You should open the image in a new tab and scroll around.
It seems that you'll get no human-like answers until your ticket is escalated. This is exactly what I'm experiencing, but what this guy did here would be to tiring for me to do. Basically I posted about my source connecting problems, but what they do is give a stock answer with links from the steam troubleshooting( even though I told them I already read those links and nothing got fixed) and then close my question. Have fun reading.