I'm really sorry that you're having issues with voicemail. I wan to get this all sorted for you.
It seems like the diverts on the voicemail aren't enabled correctly. I can fix this for you. I've sent you a PM detailing the next steps. You can view this by clicking the purple envelope in the top right.
I recently upgraded to a Samsung S7, and have discovered that I do not have a voicemail app. This is a problem because without the app, I do not receive voicemail notifications. I can call my number and leave a voicemail (from another phone), and I can dial either 1 or my number and retrieve my voicemail. However; I do not receive any notification when a voicemail is left...as you can imagine, this makes it very difficult to know if someone has left me a message. To note, my device initially set-up without any Virgin Mobile apps. I have tried to install numerous 3rd party voicemail apps, however none of them work on the device.
I am having the same issues .... I have called customer service and they were less than useless. My voicemail is set up, I have recorded a personal getting etc. But when I call the mobile from my landline I just a message saying: The mobile phone you have called is currently unavailable, please try again later!
I was informed by customer service that if I hadn't received any messages for a month then the service is disabled!!! **bleep** ... how can a service be turned off just because you've not had a VM for a month. If this is true then I will be returning to vodaphone.