Overall good car rental experience but could have been improved by less time to pickup

Paid in full, but couldn't pick up the car at the store as it was rented to someone else.

Okay

Very convenient, 200 meters left from the terminal exit

Onboarding and Guidance was on point - they had made sure that I understood the rules before handover. The car was fresh and clean as I was given the keys for a brand new car which had only driven 17 kms.

10/10 for the customer support an booking experience

The system automatically gives Europcar 10/10 based on the answers I gave to the questions about Europcar. However I would like to say that for overall rating, I think Europcar deserves a 7.5 out of 10 and that was because they upgraded me from an intermediate (I had booked a Toyota Corolla) to a SUV, a Holden Equinox, and charged me for the upgrade. When I asked the staff on duty, they said they did not charge for the upgrade. However when I received the invoice the extra that I paid was listed as upgrade of car. I feel that this is not very ethical of Europcar. They should give me the same class of car that I booked or if they are unable to, to give me an upgrade with no extra charge. I have no complain regarding the car itself. My issue is the ethics of Europcar rental policy.