I am trying to write a script that calls the function clear_single_feed_cache() within a class CFF_Feed_Saver_Manager from a wordpress plugin but cannot get it to work. I am not sure if this is because the function I am trying to call has another class within the function. please help. Here is the class and function I am trying to call and below that is my code trying to call that function.
Class & function:

<?php 
 namespace CustomFacebookFeedBuilder;

use CustomFacebookFeedAdminTraitsCFF_Feed_Templates_Settings;
use CustomFacebookFeedSB_Facebook_Data_Encryption;
use CustomFacebookFeedSB_Facebook_Data_Manager;
use CustomFacebookFeedCFF_Events_Parser;
   
class CFF_Feed_Saver_Manager {
    use CFF_Feed_Templates_Settings;

public static function hooks() {
            add_action( 'wp_ajax_cff_feed_saver_manager_clear_single_feed_cache', array( 'CustomFacebookFeedBuilderCFF_Feed_Saver_Manager', 'clear_single_feed_cache' ) );}

    public static function clear_single_feed_cache() {
        $feed_id = '12';
            $feed_cache = new CustomFacebookFeedCFF_Cache( $feed_id );
            $feed_cache->clear( 'all' );
            $feed_cache->clear( 'posts' );
    }
    } ?>

My Code:

add_action( 'run_cff_clear_feed', 'myCFFclearFeed');

function myCFFclearFeed() {
   require_once '/var/www/wp-content/plugins/custom-facebook-feed-pro/inc/Builder/CFF_Feed_Saver_Manager.php';
      require_once '/var/www/wp-content/plugins/custom-facebook-feed-pro/inc/CFF_Cache.php';
    $object = new CFF_Feed_Saver_Manager();
$object->clear_single_feed_cache();
                } ?>