Weekend in Vegas

I met up with friends because there was a 50th birthday to celebrate. I rented a car. I've done it before, even used the same company many times, in many different cities. I've never had a problem until now. I used express rental car return, because I had a flight to catch and there were only two people checking-in cars. This was Tuesday. I received the final bill via email this morning. I was billed $34 for refueling. Um, I re-filled the tank myself before returning it to the airport. The return time said 4:00pm. My flight left at 2:55pm, so I returned the car before 11:30am. I telephoned customer service and got the $34 refunded. I was told that I would have to call the LAS office to have the return time corrected. I will sit in the car until someone arrives to check-in the car from now on.