Never available when you need & no Uber contact no

Can't find any email address or contact number for Uber customer service. Have tried to get an Uber service (Dbn & Jhb) a number of times - with 1 success out of about 10 attempts! The once was very good but for the rest all I ever get is \All Uberx are in use - please check back". Despite trying & trying no luck and when you need to get from a conference venue to catch a flight"