According to ZPDee’s contact page, you can contact them 24/7 using their hotline 631-0000. But try calling them at night, and you’ll get into an answering machine telling you to wait for the next available agent. I would rather have preferred to have been told to leave at once. For me, this is just bloody misrepresentation!
They also have an SMS contact number at 0917-631-0000 (i.e., if you’re using Globe), but don’t bother texting them, you’ll just put your credits into waste.