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Hi @Axoman,
You may try if this will work if you're on a TPG plan on the Vodafone network. (If you're on a TPG plan using the Optus network let me know and I'll see if I can find how to do it.)
This will probably delete any current voicemail/diversion settings, your recorded voicemail message and any stored voicemail messages.
If it hasn't solved the issue, PM us with your TPG mobile number or Customer ID.
-Ahra_G