How do I fill out "loan balance" page for a mortgage that sold our mortgage to a different lender?

My mortgage company sold our mortgage to a different company. How do I fill out the following questions? 'Enter your loan balance as of January 1, 2023, or the final principal balance if you paid off this loan in 2022' & 'Enter the date you made your final payment, or leave blank if you haven't paid off your loan'.

Do I fill in "0" and the last date I made a payment to that particular company? or, something else? I didn't pay off this loan, it just changed companies because they sold it, which is why I'm not sure.