I wish I could give Airbnb 0 star. Worst customer ...

I wish I could give Airbnb 0 star. Worst customer service ever. It took me 30 minutes waiting on the phone to speak to the customer service. The host promised to give me the refund ($350) after I canceled the booking, but only give me a refund of $30. The host also rent the room to other guests after I cancelled the room, making double income. The customer service was impatient and not helpful at all. I guess I learn a lesson at the expense of $320, and I will never use Airbnb!!!!