Hi Hotmancool,
Thank you for reaching out to us in our community and welcome, I am sorry you haven't been able to access your voicemail due to not having a pin, this is something you are meant to set up before leaving the country I am sorry if this something you weren't made aware of.
Have you been able to get in touch with us since posting? If not, please let us know and we can look to resetting your pin for you from here.
Kind regards,
Paul.