Bit of background, I'm a new Plusnet customer and as I had with my previous provider I wanted a static IP address. What I therefore did straight after ordering my broadband and logging in was add the Static IP Address Bolt-On. The issue arose when my broadband order completed; the static IP address bolt-on was still showing as active with the "remove this bolt-on" button still present, however when in the static IP configuration page it was showing as "Current Status: You are now using a dynamic IP address". Hence even though I restarted my modem & router several times I kept on receiving a new IP address each time.
What appears to have happened is that when the broadband was activated, as in every case, the configuration gets set up as a dynamic IP address. This therefore overwrote the IP configuration back to dynamic but still left the static IP bolt-on active (and I'm pretty sure I'm going to be charged the £5 which I will have to sort out). Got this sorted out by asking customer services to remove and re-add the bolt-on as I knew this would reset the IP configuration (and so that they could refund me at the same time).
A simple fix would be to disable the static IP bolt-on button until the broadband order is marked as complete.
Likely caused the issue in this thread: https://community.plus.net/t5/Everything-else/Static-IP-Bolt-On-Problem/m-p/1593340#M20465
