Happy to cancel don't need u

I arrived at Europcar gave my booking number Chris handled the booking completed the documentation and tells my wife we upgraded you from a Kia Picanto to a Nissan Micra what a nice upgrade. I said thank you but I prefer the Kia Picanto. He called his manager who immediately accused me of asking for an upgrade which I never did. I said to him there stands a Picanto rudely really rudely he tells me that if you want that car you must pay as if I wasn't paying for the Picanto anyway. I asked for his manager and regional manager he mentioned that they are all off duty and he cannot contact them. I had him call customer care after that he suddenly managed to call his branch manager and regional manager and gives them a completely different story. lies lies and more deciet. Furthermore he tells me that if I want a Picanto I will need to wait for a long time I asked why can I not get the one standing outside he says its booked for another client. I asked him what is so special about that client. He was too happy to cancel the booking and leave me stranded. I want europcar to cancel my booking for 15 days in Dubai I will never use them ever again. He refused to apologise.