Sucks Lewis, I'm lucky to have a great connection but a mate of mine has suffered on a worse than dialup connection for about 5 years and has also been waiting for NBN. They've delayed it at least a year from initial forecast... don't think there's much you can do
A quick tip for those out there who are on Telstra since it's relevant. If you're having issues with your service (NBN, phone, whatever) - when you call up to try to get help make sure you lodge a complaint. Literally say the words "I would like to lodge an official complaint about this issue" and do not hang up the phone until they give you the complaint number.
Once that's done, you should be assigned a case manager - generally someone who doesn't just read off a script and can actually provide assistance. I've been navigating the woes of Telstra for a good 15 years and this is the best method I've found. Also feel free to ask your case manager for compensation for any issues you've had. I reckon I've had at least $500+ removed from my bills over the past 2-3 years through doing this.