"I had appointment set a week..."

I had appointment set a week before and when I turn up on time,they don't show up. When I call in the office, instead me how I will see the property and just need to knock on the door -as I did, but again nothing. So I ended up waiting 30min on the front door and the agency send my calls to mailbox. Is not a nice way to treat pregnant lady in her wast weeks before birth. Really disappointing, necer will book viewing with them again.