A lot of it sounds fishy.
First, it seems odd that they wanted a
paternity test, but then dropped it when she wouldn't do it. However, I guess it's possible.
Second, I don't see any way that they'd notify her of CS without notifying him.
Finally, I can't see how she'd be awarded
child support at all when the temporary hearing hasn't even occurred.
If she's unwilling to discuss visitation, I'd file for an immediate emergency hearing on visitation. In fact, if sh's that unstable, you might even file for custody on the basis that she's unfit because she refuses to allow your son to see the child.
Your attorney can straighten it out, but you'll probably start by asking her for a copy of all the documents she claims to have.
You might also go to the Socrateaser board. However, he won't respond to you - your son is the one who would need to post.
Oh, and $675 per month doesn't seem that far out of the question since he's making over $28 K per year. Maybe a little high, but not that bad. You can look up the child support calculator for Oregon online to check it.
Good luck.