Overpayment letter from the unemployment office - any advice?

I received a letter saying I was overpaid about $600 on my claim. I have been trying to stay organised about it. I did not notice any errors at the time.

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.

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