Extend a class of a plugin

Woocommerce support sent me the solution of my problem:

function unregister_parent_hook() {
  if ( function_exists( 'wc_dve' ) ) {
    $instance = wc_dve();
   remove_action( 'woocommerce_after_order_notes', array( $instance, 'exemption_field' ) );
    }
 }

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