We had a bad experience with Uber's nonexistent "customer service". We used Uber for a ride in Nashville. The first driver arriving was Shaun in a white durango with a listed license number (which I do not have). When he arrived, there was a printed sign on the passenger door stating that anyone entering the vehicle had to pre-agree to leave him a 5 star review (which we ignored). When we sat down, he announced there were two "rules" he was enforcing. 1. His vehicle was "modified" (illegal muffler modification) and was extremely loud, and that we would not mention that in a review and would give him 5 stars, and that if we reneged and gave him less stars, he would do the same to us. I would not agree to this so he cancelled the ride, and we exited. (never found out what the second "rule" was!!) I wanted to let Uber know about this obvious violator of their rules. Since we did not take the ride, the usual mechanism to rate a ride was not available. After doing extensive googling, I found that it is near impossible to contact Uber by phone, email or any way EXCEPT to go to their Facebook page and do a message. I did that. The receiver of the message put us in touch with customer service by email. Unfortunately that was also worthless, as their responses could have been computer generated. They did not read our issue, and said we should rate the driver through the app (impossible since the ride was cancelled). After going back and forth several times with the CSR, and seeing they were paying NO ATTENTION to what I wrote, I gave up. They should know, from their side of their platform, what driver was originally assigned to us. Bad drivers are clearly of no interest to them!