form with automatic invoice

Hi there

The form on this page, once its been submitted needs to generate an automatic invoice that’s emailed to the client.

In need of a simple way to do this, hoping there is someone out there who’s done this before and knows of a suitable plugin to use. Don’t mind changing the plugin used to create the form, that was created using the Visual Form Builder plugin, but it needs the automatic invoice emailed after the form has been completed and submitted.

Thanks in advance

The page I need help with: [log in to see the link]