Overpayment letter from the unemployment office after 6 years as an IT help-desk technician

After 22 weeks of benefits I got a notice saying I must repay some of it. I worked as an IT help-desk technician before this. The letter mentions an appeal window and a repayment plan. Are payment plans possible?

Collect your pay stubs and certification records for the weeks they name. Mine showed the error was a date mix-up.

Thanks for writing this out. I went through something close to it last year, and it got easier once I kept a simple log of every call and form.