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    public function merge_to_pdf($params)
    {
        $allowed_extensions = ['doc', 'docx', 'pdf'];
        $documents          = $params['documents'];
        $module             = $params['module'];

        $core_path = substr(COREPATH, 0, -12);
        require_once $core_path . '/application/libraries/phpdocx-premium-14-ns/Classes/Phpdocx/Create/CreateDocx.php';
        require_once $core_path . '/application/libraries/phpdocx-premium-14-ns/Classes/Phpdocx/Libs/TCPDF_lib.php';

        $module_attachments_folder_path = $this->get_module_container_path($module) . DIRECTORY_SEPARATOR;
        $module_tmp_folder_path         = $this->ci->config->item('files_path') . DIRECTORY_SEPARATOR . 'tmp' . DIRECTORY_SEPARATOR;
        $module_folder                  = $this->get_module_properties($module, 'container');
        if (is_dir($module_tmp_folder_path . $module_folder)) {
            $module_tmp_folder_path = $module_tmp_folder_path . $module_folder . DIRECTORY_SEPARATOR;
        }
        $pdf = new TCPDI();

I am trying to upgrade phpdocx to 14, I am encountering : undefined function TCPDI 
how should i call it?