The site really looks cool and easy to navigate. may be you would want to add the available size on the product page as it will help your customers and also you do not have to help page may be you are working on it.
I am not too sure about the alignment of the page Whether if you have aligned to body to the right and navigations on the left on purpose but it doesn't look good.
May be you would want to highlight some game on a banner rather than just categories.
The best way to handle irate customer is to listen, respond and act. First of why is the customer angry either he is not happy with the product or the service he received. By listening to him will help you understand his frustration, responding correctly to his query will calm him down and by acting you will resolve his issue.