VAT is a European-based tax, and Seller Labs is a US-based company. We do not have a VAT number, so we cannot provide a VAT Invoice.
To access your invoices, log into your Seller Labs Account. From the left side menu, select "Billing Information", and you can view each invoice under "Payment Activity". If you click "View Invoice" in the Action column, it will give you a full page version of the invoice.