Unemployment Overpayment

I have been informed that I was overpaid unemployment in 2020.  When I filed I told them to take out 10% for taxes.  They want me now to pay back the overpayment but how does this work when I've already paid taxes on it.  Say I overpaid $2,000 and paid $200 in taxes.  Do I only pay back $1,800?  If I pay back the full $2,000 how do I get back the $200 I already paid in taxes against that amount?