No after sale support to ********* behaviour.

I recently used Uber for a short trip within Centurion, I marked on the app that CASH will be paid for the trip. Driver was polite and on time however when the trip ended and payment was to be made - the driver did not have any change and while this was happening the clock and meter was still ticking - ( Amount on the app when confirmed was R57.00, but payment for trip was R53.00 and a few minutes later it was up to R60.00, ) The driver took it upon himself to change method of payment from cash to card, I eventually added my card but payment was declined - not sure what the reason was!! I did manage to get change from the business I was going to and PAID THE DRIVER IN CASH - WITH A TIP. I now see that the amount is still outstanding on the app and I received a message that this will be billed the next time I use Uber. THIS IS ***** - your driver should have cleared this on receipt of the CASH payment. I have tried to contact the numbers on the website - which is ridiculously inactive without any notice when this will be up and running, the APP does not have a contact message service , there is not way to contact anyone at Uber. It does seem that for the poor commitment & support services , an alternative TAXI service is going to be used. Totally unacceptable & ********* .