The IRS sees anything with a routing number and account number as a "bank account" so it is likely going to your prepaid Visa when they issue the refund. If your TurboTax fees are being deducted from it, it takes a few days for it to go through the third party bank before it goes on your card.
Your tax refund was not sent to TurboTax. TurboTax does not handle your refund at all.
Santa Barbara Tax Products Group, LLC (SBTPG) is the bank that handles the Refund Processing Service when you choose to have your TurboTax fees deducted from your refund. This option also has an additional charge from the bank that processes the transaction.
You can contact them SBTPG, toll-free, at 1-877-908-7228 or go to their secure website www.sbtpg.com