I think it is a call from National Car Rental....others have said it is from Enterprise. If you have rented a car lately it will most likely be a survey about your experience. I just rented from National Car Co.
 Aug 18th, 2010
Someone tried to call me from 202-870-5900 and did not leave a message. I called them back and got a recording that stated since this is a marketing research company the do not call list does not apply to them. The recording advised me to call 800-864-8601 and leave my phone number if I wanted to be added to their do not call list which I did. Was advised it will take up to three days to get my number excluded from their system.
 Aug 16th, 2010
The called late in the evening (I live in Canada) and leave no message.
 Jul 27th, 2010
Same here. Called the cell phone and asked for some guy?????
 Jul 21st, 2010
They ring my cell and if I answer say nothing and do not leave a message either. I am getting sick of them because they keep calling my cellphone late in the evening when I am resting.
 Jun 17th, 2010