I have checked your NBN-FTTN 50/20 service in our systems, and have created a fault for our engineers to investigate.
Someone should call you within 24-48hrs.
I have PMed you your fault reference number.
Regarding payments, generally we need a fault START date and an END date before any adjustments/compensation can be determined.
Give us a chance to fix your fault and get your service working before deciding next moves.