Overpayment letter from the unemployment office

I received a letter saying I was overpaid about $900 on my claim. It has been a long 14 weeks. I did not notice any errors at the time. Are payment plans possible?

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

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