Hard to know what to do mate. For all the negativity VW have caused, the GTI is still the car I wanted all along so I wouldn't have had any alternatives other than to just cancel and stick with what I've got now. If you'd be happy with the A3, it cant hurt to investigate, but the chances are if you were due for build this week, you really should see movement soon.
Your right though, when spending so much we shouldn't get treat like we have, and I for one will be writing a letter or two.