I agree with T_Bone, there are a lot of things that can prevent an email from being delivered, and if it was filtered you might not even receive a bounce message.
Why not call them and insist that they refund the price of the call as part of their customer service? Honestly though, if your policy is you can't call overseas about a product, then maybe ordering from overseas is something you should avoid in the future. It's also a little strange that once you determined the board didn't work, the first thing you did is start popping components off of it - did you read the warranty conditions before you did that?
