Essentially these three chicks, one of which is a friend that I've gone on trips with beforehand to great fun (essentially I had no reason to doubt them)invited my bro and I to go skiing with them. It was all good and then on the way back they pretended that they spontaneously wanted to go to a spa for an hour (that is in the middle of nowhere), that no we could not come, and that we would have to wait in a coffee shop/bar until their return. As they were driving, we were basically forced out of the car and waited 2 hours for their return. I was silent the whole time on the car ride back, though my friend questioned them and got the truth out of them (for his own satisfaction of them admitting it was premeditated and not actually spontaneous, useless as that may be). The only silver lining is that we haven't paid our share for the rented car yet, what should my current plan of action be?

Edit: and yes, I did try to get find a way back on my own but it was in the middle of nowhere.