Overpayment letter from the unemployment office - what worked for you?

After 14 weeks of benefits I got a notice saying I must repay some of it. There are 7 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 saved me later.

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.