A quick call.
A useful start.

Have these details in mind when you call. You do not need to diagnose the problem or move the door to collect information.

1. What changed?

   Describe the problem and anything you already noticed during normal use.

2. Where did the door stop?

   Say whether it is closed, partly open or fully open. Keep clear of visible damage.

3. Where is the property?

   Confirm the address, residential door type and any shared-access arrangement.

4. What happens next?

   Ask about appointment availability and any visit charge before arranging service.