Overpayment letter from the unemployment office

I received a letter saying I was overpaid about $300 on my claim. I did not notice any errors at the time. Are payment plans possible?

Thanks for writing this out. I went through something close to it 2 months ago, and it settled down once I kept a simple log of every call and form.

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