Uber bad online client service

I haven't used my Uber account for a while so the other day I wanted to use Uber eats but couldn't because there was a payment of R727 still owing. I know about this trip and I paid cash but according to them I never did. So they took the word of a driver above mine as a client. I asked them to explain to me what driver will allow you to exit his vehicle and not pay R727 for the trip? Drivers will keep you in their car for a R50 trip ne er mind R727! I've found the receipt in my emails and sent that to them. Proving to them that the driver accepted the cash. At lest you can't complain about customer service as it's non existent. It's been almost 2 weeks that I've been asking a supervisor to contact me etc with no response from their agents on the app help service. Well done Uber! Maybe get competent people that will actually go and investigate an incident like this and not just keep telling the client that they must follow a link to go settle an amount the client already paid.