What do I do when the error message reads "Code already in use"?

Yes, I rechecked the code to make I entered the correct one.  When I try to log into Origin login window with my ID & password, a red box shows up at the top of the login window & the message reads "the code has already been used".  I called the store, they said to uninstall & re-install the app & try again.  I did, it did not help.  Now what???