Lately most of the exchanges won't reply to you for ages, a consequence of the tsunami of new users whi have been joining all of them. Some exchanges have hundreds of thousands of customers by now and they didn't scale up with their support. And Bittrex has become one of the biggest lately.
for me thats not the point. First rule is respect the old members, through them the exchanges got huge and expanded. And then take newcomers in. But thanks for all the support