Got an overpayment notice, what now?

I received a letter saying I was overpaid about $500 on my claim. I have been trying to stay organised about it. The letter mentions an appeal window and a repayment plan. Are payment plans possible?

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

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.