Overpayment letter from the unemployment office - what worked for you?

The agency says I reported earnings incorrectly, but I think I followed the instructions. I did not notice any errors at the time. Who should I talk to first?

Keep everything in writing and save the confirmation numbers. It saved me later.

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.