Hello, friend!
DG8045 is a carrier series device. According to your description, you can connect to the wireless network of the DG8045 but cannot access the Internet. Because you belong to a home network, the home network accesses the Internet by purchasing bandwidth services from the ISP. If your purchased bandwidth service has expired and has not been renewed, the ISP will disable your network access service. If you cannot access the network because you have purchased the bandwidth service but have not been in arrears, you need to confirm with the ISP why your network access fails and provide corresponding solutions.
Thanks!