That is bullsh*t. Did you pay the 10% deposit yet?

They did not register your car yet, if they have registered the car, you can't change the colour since the VIN number will be registered to your name already. If they want to change the colour after registration, they need to repaint the car, which will cost them alot of money.

They just allocated the car to you and they have processed the loan application. Check with the bank whether any payment has been made to UMW. If nothing yet then you still have a chance, contact the bank directly to cancel, maybe need to pay penalty but if you are planning to buy another car, you can tell the bank that you still want the loan but for another model.