Overpayment letter from the unemployment office, software tester here

I received a letter saying I was overpaid about $300 on my claim. I am in Wichita, in case local advice matters. 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.