Overpayment letter from the unemployment office after 17 years as a bank teller

After 12 weeks of benefits I got a notice saying I must repay some of it. I worked as a bank teller before this. The letter mentions an appeal window and a repayment plan. Has anyone disputed one of these?

I asked for a waiver and a plan in the same call, and they gave me both forms. It was less scary than I expected.