what/where do I get the voicemail pin - not accepting my normal pin code?
it's as simple as dialling 171 and putting in a pin code which on further dialling 171 is requested.
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What do you mean by your "normal PIN code"?
If you mean your SIM PIN code then it's not that.
See here for how to use voicemail:
How do I use my Voicemail?
Hope this helps.
Do you mean that it IS accepting your PIN after all?
no only when it was reset
When what was reset?