Did both amounts go through as a charge, or is one of them pending (a temporary authorization). 

• If that second amount is pending: Contact your bank or credit card company if you wish to remove it before the 24-72 hour drop-off period.

• If the amount is an actual duplicate charge, please contact us for assistance. If possible, have your order or confirmation number handy.

For more information see TurboTax FAQ: https://ttlc.intuit.com/replies/3300086