Overpayment letter from the unemployment office after 12 years as a project coordinator

After 15 weeks of benefits I got a notice saying I must repay some of it. I do not usually post, so bear with me. I cannot afford to repay it all at once. Has anyone disputed one of these?

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.