You can send new invoice. On you your personal ebay page, find SOLD items, each item has #, price, Paid Date, etc, look for the last tab "Action" usually said "Sell Similar" there is drop down menu, find "Send Revised Invoice"
Sending invoices - Help Page
http://pages.ebay.ca/help/pay/checkout-invoices.html
OR you can call ebay costumer service, top right corner "Help & Contact"
and they don't have option for emails.