OK, here is what I found out from putting in a Support Request....
"Our listing services are free of charge, however, the invoice you received pertains to Auctiva Shipping Insurance policies that were generated with respect to your account. If you were unaware of your participation in our shipping insurance program and therefore do not need these policies, you can receive a credit for the charges you have accrued up to this point.
Please log-in to your Auctiva account and, if you have never made a payment to your Auctiva Shipping Insurance account and you owe more than $5.00, you will be presented with a page describing these charges containing a couple options. If you would like to continue using Auctiva Shipping Insurance, you can make a payment from that page. On the other hand, if are not using Auctiva Shipping Insurance and would like these charges to be refunded to, just click the "Deactivate Auctiva Shipping Insurance" button on that page.
So there you have it! Thanks for your help everyone and choochooguy's suggestion to fill out a support request.
D