Valve's Steam is very poor. Playing games have many bugs and problems.
The problem is that there is literally no way to get in touch with them once there is a problem. There are NO WAY to resolve billing or technical issues.
There are many people upset about this issue. Simply google "Steam Support" and you see many post by many many people.
There is no phone number or AOL. There is simply a form to fill out. I have filled out 4 questions, both techical and billing and I have not heard back from them.
Not being able to discuss or argue billing issue is immoral and probably illegal.
Do not download games from Steam.