Thanks for checking for me - as long as the correct landline number is showing from there that's fine. The error which you're receiving when you go to the upgrades and offers section will be unrelated. This is just as not all package changes can be made online.
We're looking into this a bit further for you behind the scenes, so we will get back to you once we have any updates.
If you need anything else in the meantime just let us know.
Interestingly, after your engineer called and asked which port I was using on the Modem for the phone plug I checked them out.
The Phone is currently plugged into socket 1, and not working. When I switch it to socket 2, it doesn't work either.
When I was putting the cable back into socket one, at about half way in, it did connect the call. As I pushed the phone connector in fully, it dropped it. So maybe its a bad connection on the modem, connecting the phone cable.
An engineer is coming tomorrow, so hopefully that helps.