I will probably never use Airbnb ever again after ...

I will probably never use Airbnb ever again after my next trip. I booked a unit in April, only to be extorted by the owner after the fact for more money which I did not pay. The owner waited until October to then cancel on me which then cost me $1200 more to get a new place last minute for our xmas holiday in Breckenridge. I was promised $300 credit to my amex for the inconvenience and to date has not happened. Every time I call I get an agent in another country and its all lip service. The worst is that because the owner cancelled on me I cannot even write a review of her unit to warn others. I am a seasoned traveler and have never had such a horrible situation. I will only use VRBO moving forward. Every trip we have had with them has been perfect!!