Hi @aispeake, thanks for your post although I'm sorry to hear of your concerns regarding the voicemail PIN.
Can you please try and access your voicemail by dialing 222, this may allow you to access it without the PIN message. If this works, accessing your voicemail through other means should also now work.
Please let me know how you get on, or if you need any further help following this!
Many thanks
Tom_W