Overpayment letter from the unemployment office - 9 months and counting

I received a letter saying I was overpaid about $700 on my claim. I do not usually post, so bear with me. I did not notice any errors at the time. Has anyone disputed one of these?

If you are unsure, free legal aid in your area may help for this kind of notice.

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.