I have had some problem with the NBN myself, between being lied to by Telstra and having someone come into my house without me even ordering the NBN it has been a nightmare.. 

A month or so ago I got a call from Telstra saying that there would be someone coming around to prepare me for the NBN, I didn't have a choice about anything as it had to be done due to the NBN switch over in 3 months (It's actually a year) so I was basically strong armed into making the appointment. He said they would require two vists, one outside where they wouldn't have to do anything to the inside of the house, and one visit inside the house to switch over the phone lines.. The first visit actually did need access to my house to screw the NBN box in.

The next apointment was for the phone line switch over, before starting he informed me that if he continued  then I would lose my internet connection and wouldn't be able to use the phone... 

All this had been done on the assumption that I had made a phonecall asking for the NBN to be put on when I made no such phone call 

There have also been complaints about Telstra re-sellers calling people and coercing them into connecting with Telstra as they're made to feel they have no choice when in reality, the copper lines aren't being switched off until July next year