Hi miffyz,
Thanks for your post and welcome to the forums. It's great having you on board with us in the Community.
We're sorry to hear you're having an issue with removing the Voicemail feature. It does come as standard with our landlines however if you don't want to take advantage of it, we can remove it for you.
We will need to check your details and pass data protection with you so I have sent you a private message regarding this. Just click on the little plum envelope at the top right-hand side of the page to access your inbox.
Thanks,