False Advertising

I booked accommodation at the coast via Airbnb.com on Friday, 5 October. The deposit was immediately debited from my account and I received a receipt and booking confirmation. I then contacted the agent (Chantell Steemkamp from your Zinkwazi Beach Branch) to ask a few questions about the property - are there braai facilities, etc. A while later she informed me that as it is over the Christmas period, the price has gone up from R1300 per night to R2474 per night!!!! I explained it was false advertising and we could not afford such a drastic price increase. She apologised and I was then told not to worry and we could stick to the original price of R1300 per night. 3 days later she let me know the owners of the property did not accept the price - that is not my problem as the owners did not place the listing, Harcourts did! Then I was told there was a "glitch" in the booking system. Also not my problem. I did not communicate telephonically with Chantell but only via email and the Airbnb website so I have all communication referring to this. During the 3 days that we were booked and deposit paid, I booked and paid a deposit for Xmas lunch at a nearby Hotel too. Yesterday morning she cancelled my reservation completely without warning. We are without accommodation now! Although she did offer another property, the dates she proposed were from the 1 - 15 December (we specifically need property from 22-29 December) and it did not have all the amenities as our booked property. I would like our booking reinstated and if there is a price difference, Harcourts and Airbnb should work out the difference in cost - unless Harcourts can give us another property similar to the one we booked between 22-29th December at the same cost!