Its also possible your line is crossed with another. If you dial 147017070, you will get an announcement telling you your phone number.
Check this against the phone number shown on your bill, to make sure its the same.
The object of the test is to prove whether the filter in the master socket is faulty.
If it still does not work with a microfilter, then either the home hub is faulty, or there is a fault withing the Openreach fibre cabinet.
If that is the case, all you can do is to report it to BT, as a broadband fault. They may initially send you another home hub to try.
If it does work with a microfilter, then it proves that the filter in the master socket faceplate is faulty.