Driver misconduct

I took a trip in the 31 July 2019. I was not aware that I was registered for card payment. At the end of the trip I paid cash. The driver accepted cash even though his phone notified him not to accept cash since I paid via card. Driver's name is Eric Mbongiseni. When I arrived at my destination my phone notified me of the card payment. I decided to contact their support via the app to report the incident. They told me that they had contacted the driver and they are waiting for his response and they will let me know the outcome. Two weeks later I requested feedback but there was no response. I requested a refund anf they promised to credit my account within 7 to 14 days. Till today I have not received my money. I cant contact them anymore since they decided to close my case. Im so disappointed in this company and I don't know where to report them.