I have checked your NBN-FTTN 50/20 service out on our systems and it shows your modem is offline.
Can you confirm it is still plugged into the socket and powered on?
What is the status of the DSL light.
I could see the fault you lodge via app #10512203.
I have escalated this to our NBN teams to check out quicker for you.
Someone will call you back ASAP within 48hrs to help resolve it.