You should file updated federal and state withholding forms claiming total exemption as a non-resident.
The only way to get withholding back is to file an original or amended return that reports zero relevant income (a 1040-X and a state return). You show no taxable income and no tax owed, so that should calculate a full refund.
You should have already gotten full refunds from your 1040-Xs that you already filed, so I wonder what went wrong on those returns.
