Anyone know how to add the namespace in the <QueryAbc> node?

Yes, Util does.

However, you'll want to make sure that you call it _after_ your call to service(), so it overrides whatever's in your wsdl. Of course, if it were me, I'd just change the wsdl so it had the namespace in it (and the proxy ... which I'm guessing it has in it, and your call to proxy() is superfluous.