Told I owe money back on my benefits (Toledo)

The agency says I reported earnings incorrectly, but I think I followed the instructions. This is my first time dealing with any of this. The letter mentions an appeal window and a repayment plan. Has anyone disputed one of these?

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