All our products on NobelCom have an expiration date of 365 days after the last use.
If you do not see your PIN in your online account anymore, it means that it's been more than a year since you last placed phone call with it and unfortunately it is now expired.
However, I would like to check out your account to make sure this is actually the case. I can't pinpoint it using the name you used here. Please provide an invoice number from one of your orders and I'll have a look and see what we can do.