After 5 years of being a regular at Enterprise/National/Alamo, I find it very disturbing that they put me on Do Not Rent list for forgetting to fill up the gas once.
I gave the credit card number, why wouldn't they just charge the gas bill?
What's really bad though is that they didn't even let me know I have unpaid balance or was on Do Not Rent list.
I found it out the hard way -- I rented another car from National, paid for it online, went to pick up the car and got rejected. Yes I did something bad, not filling up the gas, but they could've at least rejected me at the time of reservation!
The associate at the desk was totally helpless too. She shrugged and gave me a boilerplate "there is nothing I can do", handing me a phone number for National help desk.
I ended up paying again at Hertz for another car.
Bye bye Enterprise Holdings. I will live happily with Hertz and others.