NEVER attempt to rent from NU Car Rental. I made a reservation for 2 cars, pick up at Cancun airport. I received a call the day prior with directions how to call for my shuttle to pick me up to bring me to the cars.
They never picked up the phone and I tried calling the number they called me from and any other number I could find online, again with no answers.
Finally, I had to get my family to our resort so I paid a ridiculous price for a taxi. When I called NU Car Rental the next morning to ask why they did not answer the phone, they said I never called and was considered a no-show and cancelled my reservation.
This led to more expenses for obtaining a local rental car with a new company and another expensive taxi ride back to the airport.