Unhelpful and dishonest

I wish I had read all the reviews on Hello Peter before booking through rentalcars.com / booking.com. They booked me a same-day car rental through Alamo in the USA, only to find when I got to the Alamo rental counter that Alamo doesn't do same-day car rentals, and didn't have any stock available. Why does rentalcars.com book me this car when Alamo doesn't have the car available? This seems dishonest to me. When trying to claim a refund, they were entirely unhelpful, telling me that it appeared to them that I had picked up the car. You would think they would ask Alamo whether this is indeed the case but, no, this is seemingly too difficult for them to do. Instead, I am left stuck in-between them and Alamo. So, lesson learnt for me, I will rather go direct through a car rental company.