It's been two weeks and I haven't recieved the letter for enrollment. I am very anxious. What number can I ring? As the UkbA website is not very helpful

What does happen if you don't do your biometrics in 15 days?they give you fifteen days to get it done initially. if not I have heard they give you a warning letter to get it done in another 17 days? If that's true does it make your current application invalid? My 10 years complete on 30th of nov so ...