Overpayment letter from the unemployment office - 14 months and counting

The agency says I reported earnings incorrectly, but I think I followed the instructions. Thank you in advance. The letter mentions an appeal window and a repayment plan.

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

Thanks for writing this out. I went through something close to it 14 months ago, and it got easier once I kept a simple log of every call and form.