Vox not releasing the fibre line.

I've had decent, uninterrupted fibre service with Vox. Unfortunately, I've had to change to a cheaper provider. I did everything I had to do as a customer by notifying Vox 1 month in advance of my cancellation. Come 1 April, Vox has not yet issued the order to release my line, stopping my new ISP service from being able to activate on the line. It's now 4 April and Vox has still not released the line. This seems like such a simple oversight and has soured my view of them. I've logged a call with them, but all I've been told is that they have issued the release order. No ETA.