Overpayment letter from the unemployment office - first time posting

The agency says I reported earnings incorrectly, but I think I followed the instructions. There are 14 people counting on me, so I am trying to be careful. I did not notice any errors at the time. Are payment plans possible?

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.

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