To request a copy for an invoice for a billing document, you must be logged into MyAccount with an account number.
After you've logged in:-
Step 1 Click on "My Account"
Step 2 Go to "My Orders"
Step 3 Select the order you wish to get a copy invoice for
Step 4 Select the "Copy Invoice" option from the drop down menu.
An email will be sent to the email address entered with the billing document attached as a PDF. Please allow 15 minutes to receive.