I have no messages on voicemail and although I have set voicemail up, it doesn't work.
Welcome to the forums
I'm really sorry you can't get rid of the voicemail notification on the phone. I want to get this all sorted for you. Are you able to access your mailbox by dialling 222 to see if this helps?
Let me know how you get on with this.
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How are you getting on with the voicemail issues?
Let me know if you need anything at all.