Writing user meta

I want to write user meta and will also have subscribers_only: true and skip_mail: on
Nothing I am trying seems to work:

add_action('wpcf7_before_send_mail', 'my_saved_meta');
function my_saved_meta() 
{
    $submission = WPCF7_Submission::get_instance();
    if ( $submission ) 
    {
        $posted_data = $submission->get_posted_data();
    }
	global $wpdb;  	 // latest attempt
	$user_id = get_current_user_id(); 	 
update_user_meta( $user_id, 'have_swd', $posted_data['swd-radio'] );
}

Where am I going very wrong … ?