Overpayment letter from the unemployment office after 13 years as a welding apprentice

After 13 weeks of benefits I got a notice saying I must repay some of it. This is my first time dealing with any of this. The letter mentions an appeal window and a repayment plan. 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.