BP Centurion Car Wash

BP Centurion I took my Chev Utility for a full service wash and clean at the car wash this morning, joined the queue, two vehicles in the queue I was then informed another vehicle parked next to the washing bay and would be allowed to reverse into the washing bay and be cleaned before me How can I be penalised for a vehicle that parked in the wrong spot I then went to the cashier to pay, explained to her that my bakkie qualifies as a small vehicle and not a SUV, however she charged me the SUV price I did report it to the manager