Overpayment letter from the unemployment office after 6 years as a retail manager

After 3 weeks of benefits I got a notice saying I must repay some of it. I did not notice any errors at the time. Has anyone disputed one of these?

Read the letter for the appeal deadline and act on it, even if you think you will end up repaying. Then ask about a payment plan.

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