Hi there @LF1
Welcome to our Community and thanks so much for your first post - i was sorry o understand that you've has some issues with your caller display since having a technician visit. On occasion, any work on the phone line can drop call features form the telephone exchange but this should be a nice easy fix 🙂
I have located your account from your forum details and can see that this was the case - I have now activated it for you now so you should find the Caller Display will work once again. If you are still having issues, please do pop back and let us know what happens on the display and we can go from there.
Cheers