After you file

why did you think you were getting $2,000 back?   could be that the return did not reflect a stimulus payment that the IRS says you received.  note that we have no access to your return. there is probably no version of your return that currently exists that would show the $2K refund. so we are in the dark as to what changed.  however, if the filed return showed a $2K refund and yo only got $400, the IRS should be sending you a letter in 2 or 3 weeks explaining the change