UBER - no contact information for customers to contact regarding fares

I have been trying to get hold of Uber via email, and on help.uber.com since 11 March 2018, but there is NO contact information.

I took a fair from Hyde Park to Roodepoort on 11 March 2018 with the cash option. Usually my fair is no more than R 172 if the traffic is really hectic but this day in absolutely no traffic the fair was R 264. About 5 hours after taking the Uber I received a email from Uber advising that the fare has been corrected to R 150, thus I should have a credit balance of R 40 but there is absolutely no contact information anywhere to to email, phone, fax, whatsapp Uber regarding a query.