Thanks for your post and apologies to hear that you are no longer able to use call divert.
Taking a look at the account, it is still showing as active on your line. Can you please try dialling: ✱#21# for this to tell you whether or not it is still on. If it shows as no then please re-setup by dialling ✱21✱ then entering the number you wish to Divert to (inc STD code) then press #. Once this has been set up, you’ll hear a confirmation tone.
Again, thank you for sticking with me on this one.
I think we're going to need to take a closer look at your account. I will need to pass data protection with you to discuss things so I have sent you a private message regarding this and will investigate further once I receive your reply. Just click on the little plum envelope at the top right hand side of the page to access your inbox.