Got an overpayment notice, what now? - what worked for you?

After 15 weeks of benefits I got a notice saying I must repay some of it. I did not notice any errors at the time. Are payment plans possible?

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

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