Welcome back to our Community Forums! Thank you for your post, and I'm sorry to hear that you're having some issues with your Voicemail PIN.
I understand that you have done this previously, but we advise all customers to set up a new voicemail PIN every time they go abroad. You can take a look on our website to see How To Set Up a Voicemail PIN.
As you're already abroad, we will be more than happy to look into this for you via Private Message.
Please keep an eye out for a purple envelope at the top right corner of your Forum page. I will be in touch soon.