Did you select to have the fees deducted from your federal return? You need to go back though the File tab and pay the fees with a credit card. Are you in California? Are you using the Online version or the Desktop program?
You get Audit Defense when you purchase PLUS Help & Support, MAX Defend & Restore, or Premium Services for Turbo Tax Online or Audit Defense for Turbo Tax CD/download. So to remove Audit Defense you need to remove Plus or MAX or Premium Services,
Remove MAX
https://ttlc.intuit.com/community/downgrading/help/can-i-remove-max/00/26691
So to remove Audit Defense you need to remove Plus or MAX or Premium Services. See if these links still work.
Remove MAX
https://ttlc.intuit.com/community/downgrading/help/can-i-remove-max/00/26691
Remove PLUS Benefits
https://ttlc.intuit.com/community/downgrading/help/can-i-remove-plus-benefits-before-i-pay/00/26429
Remove Premium Services with Audit Defense for California filers
https://ttlc.intuit.com/community/downgrading/help/how-do-i-remove-premium-services/00/26266
