If you feel like you need to make one more effort, contact the "manager" and threaten an unflattering online review - no need to mention the one you've posted here since you don't id the property. Don't mention the specific website(s) you plan to post in. Ask for exactly what you want - a full refund. Whether you get the refund or not, you owe a warning to your fellow travelers. We're all in this together, right?