Got an overpayment notice, what now?

After 14 weeks of benefits I got a notice saying I must repay some of it. It has been a long 14 weeks. I did not notice any errors at the time.

Collect your pay stubs and certification records for the weeks they name. Mine showed the error was a date mix-up.

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.