Hi Melissa and welcome to the forum,
Crunchie is absolutely right, the problem of slow to no response to email inquiries is a blight on many suppliers. They simply refuse to treat email inquiries as a priority and in many cases, even treat them as a serious inquiry and then simply ignore them.
Now there is a host of reasons why, but none of them wash in my opinion, it simply comes down to poor customer service, however you slice it.
Our recommendation to members is exactly that of Fashion, the more direct your communication, the more effective it will be. Email, unfortunately, is one of the quickest ways of being ignored by many suppliers.
We always recommend phone where possible, if cost is a factor, I recommend looking at Skype for International calls. Using online customer service through a live chat is also a great way to interact. Even if you have to leave a message through that, chances are you will get a response back before you will via email.