Mantra, Pulau Rottnest

"Due to last minute changes in my itinerary, I had booked a last minute stay at this hotel, and when I arrived (11:30pm), the doors were closed, and eventually managed to talk with reception via an intercom system. With a non-interested rude voice, the man at reception simply said I cannot see your booking and to go away, even though I was trying to show the booking reservation confirmation and number through the camera of the intercom. I was discarded and sent away without trying to help, and...