It is still in use.
Click on "Help" at the top of this page or use this link
Get support with BT products and services | BT Help
then select the service you want, Scroll down and click on "Contact Us" and again select the service you want help about. A new page should open with a "Message Now" button on the left hand side.
If it is not showing it may not be available because there are insufficient staff to answer it so try again later.
