Overpayment letter from the unemployment office, hotel front-desk agent here

The agency says I reported earnings incorrectly, but I think I followed the instructions. Any experience at all would help. The letter mentions an appeal window and a repayment plan. Are payment plans possible?

Keep everything in writing and save the confirmation numbers. It saved me later.

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