Overpayment letter from the unemployment office

I received a letter saying I was overpaid about $750 on my claim. It has been weighing on me all week. I did not notice any errors at the time. Are payment plans possible?

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.

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