Told I owe money back on my benefits (update)

I received a letter saying I was overpaid about $700 on my claim. I cannot afford to repay it all at once. Has anyone disputed one of these?

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

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