A timeline of iiNet task 295460381, for anyone assigned to my case:
13NOV - I have been connected to ADSL 2+ for several months and getting a download rate of ~12Mbps
14NOV - I am informed that NBN FTTN is available in my area and decide to make the switch
25NOV - The NBN service is provisioned and I attempt to connect. I am unable to do so because my modem is incompatible. I go out and purchase a new modem and set it up myself. It connects at ~4Mbps down, 8Mbps up. I send an email to the customer service rep about this and receive no response.
27NOV - My internet disconnects. I am informed that there is an issue in my area and it will be resolved the next day.
28NOV - My ticket is closed and marked resolved. I still have no connection.
30NOV - I call support and get walked through modem troubleshooting. I still have no internet. I am promised a callback.
1DEC - I get no callback and ring support again. I am asked to run through troubleshooting again. I still have no internet. I am promised a callback.
2DEC - I get no callback and ring support again. I am asked to run through troubleshooting a third time. I am told my modem needs to be unplugged. I still have no internet. I am promised an email "the next day".
5DEC - I have not received an email and notice my ticket has been closed. I ring support again. I ask to speak to a manager and am told that one is finishing up a call with a customer and will call me as soon as they do. I do not receive a callback. I do, however, receive a bill for $211.52, as the person responsible for cancelling my ADSL2+ service failed to do so. I email billing and receive no response.
6DEC - I ring and ask to speak to a manager who is very apologetic and puts me onto a staff member who runs me through troubleshooting my modem for the fourth time. I am told there is an appointment slot with NBNCO on 8DEC. I am promised a callback the next day.
7DEC - I receive an email informing me that my service is connected and the issue resolved. I still have no internet. All details in my support notes about my modem and house are wrong. I try to ring support however an automated message tells me my account is suspended for an unpaid bill. This is impossible as I am billed monthly by credit card. My ADSL2+ service is cancelled, and billing attempts to charge me a contract break fee. It was not on a contract.
8DEC - NBNCO attends my premises and I achieve line sync. My speeds are ~4Mbps down and ~3Mbps up. I have spent approximately weeks without internet and am now paying $20/month more, and receiving download speeds 1/3 of what I previously had. I send an email to this effect and receive no response.
9DEC - My case is assigned to another person. Twice.
13DEC - I have still not heard any updates regarding my service and my download rate has not improved. I am writing this email & contacting you on twitter as a last ditch attempt to resolve this issue before escalating it to the Telecommunications Industry Ombudsman. My case is assigned to yet another person.