If a mortgagee, or a mortgagee’s personal representative or assignee, upon full performance of the conditions of the mortgage, fails to discharge such mortgage as set forth in section 655.1 , the mortgagee is liable to the mortgagor and the mortgagor’s heirs or assigns, for all actual damages caused by such failure and a penalty of five hundred dollars, plus reasonable attorney fees. A claim for such damages may be asserted in an action for discharge of the mortgage. 99 Acts, ch 54, §2 ; 2018 Acts, ch 1036, §3 Referred to in §655.6