Got an overpayment notice, what now? - 14 weeks in

I received a letter saying I was overpaid about $400 on my claim. I did not notice any errors at the time.

Thanks for writing this out. I went through something close to it 10 months ago, and it got easier once I kept a simple log of every call and form.

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