Woocommerce - remove scheduled email - wordpress

Question

I have a plugin which help me to book events. I have integrated a mail scheduler for reminder emails & feedback emails.
On confirmed booking emails are scheduled for reminder as well as feedback. I have both options to define it globally as well as individually to each event. This class is adding actions for the scheduled emails.
class WooEvent_Reminder_Email {
public function __construct()
{
add_filter( 'exc_mb_meta_boxes', array($this,'email_reminder_metadata') );
// Schedule the event when the order is completed.
add_action( 'woocommerce_order_status_completed', array( $this, 'remind_email' ), 10, 1 );
add_action( 'woocommerce_order_status_completed', array( $this, 'remind_email_fb' ), 11, 1 );
// Trigger the email.
add_action( 'wooevent_email_reminder', array( &$this, 'send_mail' ),10,4 );
add_action( 'wooevent_email_reminder_2', array( $this, 'send_mail' ),10,4 );
add_action( 'wooevent_email_reminder_3', array( $this, 'send_mail' ),10,4 );
add_action( 'wooevent_email_reminder_feedback', array( $this, 'send_mail_fb' ),10,3);
// send email to attendee
add_action( 'we_send_email_reminder', array( &$this, 'send_mail_attendee' ),10,1 );
}
Now, due to some reasons the event is not happening and I have created one more category for products "event-deactivated". If this category, I want to disable the event as well as want to remove all further email actions (i.e. no more notifications to the customer). For this objective, I am running this code:
add_filter('woocommerce_is_purchasable', 'nms3_catalog_mode_on_for_product', 10, 2 );
function nms3_catalog_mode_on_for_product( $is_purchasable, $product ) {
global $WooEvent_Reminder_Email;
if( has_term( 'seminar-deaktiviert', 'product_cat', $product->get_id() ) ) {
// you can set multiple conditions here
remove_action( 'woocommerce_after_shop_loop_item_title', 'woocommerce_template_loop_price', 10 );
remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_price', 10 );
// Trigger the email.
remove_action( 'woocommerce_order_status_completed', array( $WooEvent_Reminder_Email, 'remind_email' ), 10, 1 );
remove_action( 'woocommerce_order_status_completed', array( $WooEvent_Reminder_Email, 'remind_email_fb' ), 11, 1 );
remove_action( 'wooevent_email_reminder', array( $WooEvent_Reminder_Email, 'send_mail' ), 10, 4 );
remove_action( 'wooevent_email_reminder_2', array( $WooEvent_Reminder_Email, 'send_mail' ), 10, 4 );
remove_action( 'wooevent_email_reminder_3', array( $WooEvent_Reminder_Email, 'send_mail' ), 10, 4 );
remove_action( 'wooevent_email_reminder_feedback', array( $WooEvent_Reminder_Email, 'send_mail_fb' ), 10, 1 );
// send email to attendee
remove_action( 'we_send_email_reminder', array( &$WooEvent_Reminder_Email, 'send_mail_attendee' ),10,1 );
return false;
}
return $is_purchasable;
}
With which action/filter, I should use the above or any modifications.
I am able to disabled the event on the basis of category, but already scheduled email are still queued up.
Any suggestions or help will be appreciated.
Thanks