Broadband activation can be delayed slightly, as the phone line has to be in place and working, for the Openreach Frame Technician to complete the provisioning tests.
As its the weekend, this may be done tomorrow or Tuesday.
The line at the address was probably an old "stopped" line, which would not have the correct phone number assigned to it.
The changeover to your preferred number can take 24 hours, this is done automatically, which is probably why the number may wrong at the moment. You can dial 1470 17070, and it will tell you your number.
This can also delay broadband completion.
All you can do is to connect the home hub to your phone line as described, and wait for the broadband to synch up.
What sort of master phone socket do you have fitted, does it have one, or two connections on the front?