Ridesharing services used to be criticized in the past for poor customer service, but Uber is doing great in that field in the last couple of years. The same devices you use to book a ride, you can use to ask questions to the company. Usually, it takes quick for Uber to respond.
Uber customer service is regarded as one of the most dedicated to the work of all ridesharing companies. You can contact Uber in several different ways. If you decide on email, you can expect their answer in only a couple of hours, which is faster than most of the other ridesharing companies.
Alternatively, you can contact Uber taxi via Facebook or Twitter. Uber is partners with Facebook, so the users can book a ride using the Messenger app. If you have a question for Uber, you can send them a private message. Still, the fastest way to get in touch with them is by phone.
Furthermore, for emergency calls to Uber taxi, there is a special Uber number, which is available in 22 cities in the USA, at the moment (April 2016). By dialing 800-353-UBER (that’s 800-353-8237), you can get in touch with the emergency service for reporting serious issues about rides.
Uber urges you to call this number only in case of emergency while using it's service.
In other countries, like India, for example, Uber has a panic button as a part of their software, which you can press when you want to report a bad ride.