I accidentally used a fraudulent routing number for my bank - need help retrieving my refund...!

If your return has been accepted, you cannot change your refund information.  Since your bank information is incorrect, you will automatically be switched to receiving a check in the mail.

Thank you bluedeb - however, when I went to the IRS website to check on my refund status, it says that my refund was sent on March 11th, and of course I haven't received it. Is it possible that the refund was deposited to a scammer's account, even though the routing number and bank account number won't match?