except some top exchange, this is common problem with most exchanges. Even sometimes they response but annoying is, they behaved badly and don't try to solve the issue, just referring here and there to talk. Although its better than having nobody for response
There really is a time that they act like that, it's not understandable and cannot be tolerated. But it's a fact that someone has responded and it's better to be like that than there's no one that has been answering our questions and queries.
We have to be patient when it comes to this since we're the ones that are needing help. There are those supports that will help you quickly and reacting base on how you treat them, sad but truth.