I also received a call with no message from this number and it was 2 days after I turned in my rental car from Enterprise. I called back and was notified by a recording that it was Merit Research.
Yes, I just got a phone call from 314-558-6686 on my cell phone, I didn't pick up, and they left no message. I just rented a vehicle from Enterprise 5 days ago, and when I did, I gave them my cell phone number.
It is Enterprise, they do a quick 5 question survery on a percentage of their customers.
This survery is a HUGE deal at Enterprise. They aim for 80% completely satisfied, which let me tell is HARD! I worked there for three years and only 2 months was I able to pull an 80.
So in the interest of those hard workers there, unless it sucked real bad, give them a completely satisfied!!