Depending on when the customer support is manned, you might have to wait a (very) long time for a support agent to answer you after the first reply they make.
I can't believe I have to write this, but in case anybody asks, no, this is not fearmongering!
As they explained in their post a few days ago, your case was different. You weren't a customer and user of a swap operation. You were an outside partner and affiliate. eXch stated that they are quick to address complaints regarding their exchange operations (I think it's within 48 hours). Therefore, everything else has a lower priority. Luckily, I have never had any problems with swaps that required that I get in touch with their support to be able comment on the speed of their replies.