I had a terrible experience with Avis/Budget at Madrid Airport - avoid them like toxic water…read more
I pre-paid for a 1-week SUV rental, directly from Budget's website. At the counter, I was given a different agreement with about 40% higher fees than what I pre-paid. It included all kinds of apparently made-up fees (airport, service, etc.)
Things got even worst when I returned the car, full-tank and 1/2 hr early. I was asked to leave it and get my receipt via email, which is common returning a car in the US, so that's what I did. My receipt never came, but my credit card was charged an additional $120. Budget/US who I called informed me the charge was for returning the car 1hr late with not full tank.
I then got an email from Budget/Madrid, asking for a gas-station receipt and for my Boarding Pass - guess what: I had kept both, and send copies. 2 months later, no response/refund from Madrid. To be fair to Budget/US, they finally stepped in and refunded the charges.
Bottom line: stay away from this dishonest outfit in Madrid, and keep your gas receipts and Boarding Passes.