Overpayment letter from the unemployment office (Madison)

I received a letter saying I was overpaid about $550 on my claim. Thank you in advance. I cannot afford to repay it all at once. Who should I talk to first?

Collect your pay stubs and certification records for the weeks they name. Mine showed the error was a date mix-up.

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