Stevens Creek BMW

I bought a car from this dealership yesterday ( sales manger he was helping me!!) and they said the car in the sister's property and they will bring it tomorrow however next day I called in the morning and they said the car in it's way to them and they will let me know once they receive it, at 4 pm i received a call from one of the sales staff telling me that the car was sold to someone else, when they already did run credit and officially i bought the car i tried to reach the sales manager who helped me with the documents but no one gives me his # , I will get a lawyer and sue this company it's illegal .