Is your hub connected to a white box like this and if so are lights green like this
It is the customer responsibility (ie you) to ensure there is power available to enable openreach to connect the ONT and the HUB. Openreach will not be back with power cabling
I have already posted photo to help you so can you confirm openreach installed something like this and your hub is connected by cable
Let's start at the beginning. Is the Internet working?
Next, has your Digital Voice service been activated.
Go to the hub manager (put 192.168.1.254 in your browser address bar)
Does it show your phone number or does it say 'Not Configured'
It's not clear if you have full fibre FTTP or simply FTTC
Do you have an Openreach ONT like the picture posted by @imjolly