Having a problem with www.cdduplication.ie

Okay i'm finally going to order 50 CD and have put in the money into my Laser/Mestro card yesterday.

I went through the orders and proceeded to checkout then i chose the
'Credit Card or Bank Card (Processed by Sage Pay)' option and filled in my billing address and clicked continue.
An error then appeared telling me:
'The BillingPostCode is required. Please try again and if problems persist, please try another payment method.

what is the BillingPostCode? i cant chose another payment method beacuse as you know paypal dont accept laser cards and im not going to be writing them checks

I tried to call but got no answer.

I want to print through them beacuse I requested for free sample of the CD i wanted to print and it was perfect now that i have the money for more of them i get an error