Service OK, be aware of fuel charge after return

Car unusually old.

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.

Station manager at Alexandria station was very kind, and tried to help us as much as he could.

Like: Vehicle was in good condition ..

Like: The staff at pick up is friendly but staff at drop off is not friendly.
Dislike: I was told that cash is accepted at drop off counter, but then when I wanted to make cash payment over drop off counter, the staff told me only credit card is accepted.