How can one complain against Boxee box's fault?

If it is under warranty and even then they are not listening then this is a problem for which the company should feel shame. You can complain to their official website of boxee box and that the customer care representative is saying that they can't do anything. They will do something. If they will not do anything then tell the chairman of boxee box group. It will be definitely do something. If still they do not do something then personally consult the company executive of boxee box and tell them that they are not doing anything. They will discuss the problem and I hope they will listen to you if you will meet them personally. Or If you want some legal action then you can file a case against them. You can have consult a lawyer and he will file a complete case against this website. This is all which I can tell you. Hope your problem will get end soon.