Overpayment letter from the unemployment office (update)

The agency says I reported earnings incorrectly, but I think I followed the instructions. I cannot afford to repay it all at once. Has anyone disputed one of these?

If you are unsure, free legal aid in your area may help for this kind of notice.

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.