Told I owe money back on my benefits

The agency says I reported earnings incorrectly, but I think I followed the instructions. It has been weighing on me all week. The letter mentions an appeal window and a repayment plan. Has anyone disputed one of these?

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.