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Might be Optus or might be the phone or the fact you have no reception when the call is made (that will cause the same message). Are you in a regional area?
Regardless, Optus can't see your account here. You'll need to contact them via facebook or twitter.
Based on what you have described, it sounds like call forwarding has been turned on, which means that all your incoming calls are being automatically diverted to voicemail.
I would recommend checking the phone settings on your device to make sure that call forwarding has not been turned on. If you are unsure on how to do this, I have attached our Device Guide for you here and you can search for the make and model of your device for the relevant steps.
If the issue persists, please get in touch with our Technical Support teams via the My Optus app for further assistance.
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