Airbnb disappointment

We booked acc. Drove 200km from home and as we stopped in front of the airbnb the host Clara phoned and asked how many ppl are sleeping over. We booked for a family of for and was qouted by airbnb for 4. Suddenly she in formed us that the price was for 1 person. Now airbnb will not refund us and we have no where to sleep.