Welcome to this user forum for BT Retail phone and broadband customers.
Its up to your Service Provider to get Openreach to sort out any wiring up to the master socket, so there is no need to do anything. You are entitled to that free visit as part of your provision.
If your Service Provider is BT Retail, then that would normally be arranged within 24 hours as it would be an Early Life Failure.
If the phone works then the incoming wiring is correct.
Is there a test socket revealed when you remove the faceplate? If so try that but you'll need a filter.