Hi, I have the same problem too. No internet on Saturday. Got connected Sunday and Monday. But by 5 pm Monday arvo it dropped again until now (Tuesday 7/4) 11 am. Tried to call the tech support, being onhold for 1 hour already.
There is a problem with the NBN. They created a case for me and someone should get back to me in the next 24 hours. I encourage everyone that have issue with the internet to call and wait until they pick up. Be warn, it took 1.5 hr before I got thru.