There are four ways of getting in touch. The first, and the most convenient for any smartphone user, is through the app. Alternatively, you can also contact them using the form provided on the official website. For more traditional means, the customer service number is 800-214-6094. In case you wish to post a letter, addressing it to Avis Budget Car Rental, LLC, 6 Sylvan Way, Parsippany, NJ 07054 US will be the best course of action.