Are you connected to the same socket the previous occupant used ?, if there is more than one socket to chose from , use the Openreach ‘master’ socket , if only one socket then presumably something has gone wrong or not happened yet.
Are you getting a phone service ( not DV ) , if you are , is there a dial-tone at the socket , even if you are getting DV or no phone service it’s worth connecting a landline phone to see if there is any dial-tone , which would prove a connection back to the exchange, although a lack of dial-tone doesn’t mean there is ‘fault’, often , the ‘message’ says your service should be working and to call if it isn’t , as it’s already been noticed that your service isn’t working , they may already have invoked the ‘early life failure’ process, but it cannot hurt to contact BT to find out what’s happening
