Received a W2 showing income, Hartford Ins kept the $ to cover prior yrs over-payment. Do I ignore this W2 or how to show as no income as tax was paid in a previous year?

Hartford Insurance determined they overpaid for long term disability in prior years. They are keeping all monthly payments until over-payment is paid in full. I received a W2 for the total payments but this money was never received. How do I show this on my taxes?