Just to conclude this thread and clear any confusion I potentially introduced, most likely explanation is as described by original poster simply being the connection not being activated on time as advised, further confounded by the router showing "Connected" due to a valid DHCP address being handed out. A common convention is to use the .254 address as default gateway with /24 subnet but because Vocus/2degrees span IP addresses across BNGs they are likely issuing a smaller subnet with an adjacent IP address used as default gateway. And with that, I'm not going to make any further assumptions that get me into trouble :)