Worst rental car experience ever.

Waited 30 minutes for the off-site shuttle. Line was almost out the door. People inside said they had been waiting over 2 hours. Took at least 30 minutes for each customer rental to be completed. It was so bad that every time someone finished, everyone clapped as we moved up. Took almost 2 hrs to get to front of line. Asked about adding a second driver but cancelled request when I found it it would cost almost $40 more. Almost 3 hours to get car and leave lot. Stopped at grocery store along the way and notice gas was at quarter tank and not full. Tried calling the number highlighted on the paperwork. Told to leave a message but couldn’t cause the mailbox was full. Drove back to ACE and was told to return car with quarter tank because they do not have gas onsite and don’t have time to fill it up between rentals. Rented an intermediate car but had very little power. Car return was quick. He looked at the gas, which was at quarter tank, and car and said everything was done. No signature or paperwork required. Invoice to be emailed. Got to airport and checked email for invoice. Instead of being charged $133.91, invoice was for $265.22. Billed for gas and additional driver. Called number on invoice and was able to get items reversed. This was the easiest part about of the rental even though it shouldn’t have happened. This was the worst experience renting a car. Won’t use ACE again.