If you want the Audit Defense you originally purchased, if the charge went through it should already be in the works at the company that handles that. But you can get a refund if you don't want it at all.
If you want to keep it, you could possibly decline the purchase of it the second time around and then file. We can tell you how not to select it.. If you don't want it at all, I can tell you how to contact the company that handles it (intuit.taxaudit.com) and request a refund. Here's their contact page:
Or if you have problem getting a refund directly from them, here's how to reach TurboTax Support:
You can use the form at the link below to schedule a call back, or it may provide a number. Hours are currently 5AM-9PM Pacific (8AM-12 Midnight Eastern), but will likely change some after April 15.
Where the form asks what product you are using, be sure in the dropdown menu to indicate "CD/download" and the proper operating system, then indicate which Edition.
https://support.turbotax.intuit.com/contact
