I have checked your Father's TPG acccount and noted that there is no restrication applied and also noted that sync speed also passing based on plan, modem is also authenticated for more than 11 days, our remote speed test are also passingso may be he might need to check wireless/wired connectivity to devices from router. As to me ask your father to power cycle modem. you can get default wireless network name and password from router sticker.
I have contacted your father and noted that your father unable to login computer due to number of attemts for login with incorrect password, now windows access is locked so he might need a computer technician who can help him for windows password recovery.
For TPG side I am able to see that Modem is up and working normal so once your father has access to computer, he can use interenet.