Told I owe money back on my benefits after 18 years as a security officer

After 17 weeks of benefits I got a notice saying I must repay some of it. I worked as a security officer before this. The letter mentions an appeal window and a repayment plan. Who should I talk to first?

I asked for a waiver and a plan in the same call, and they gave me both forms. It was less scary than I expected.