This happened to me too! The last 4 digits that are showing up in the "Where's My Refund" page for the IRS are not my account number nor one I have EVER had. I have only ever used ONE account number with TurboTax to deposit my refund so I'm not sure where my money went. IRS says they sent it on the 17th to an account that doesn't belong to me and no one can help or direct me on how I can fix it. So frustrating!
