Welcome to the Community!
I'm sorry about the service disruptions you've been experiencing. Looking at your account, your case has been escalated to our Engineering Team already and from what I can tell, this has been raised to NBNCo for investigation. Indeed, there's an appointment scheduled today for NBNCo to check the recurring issue. Once a report is available, one of our Engineers will contact you via SMS or phone call regarding the case' progress. Should you have additional questions or concerns, please let us know via this thread.