I want my refund

Last night after my shift at work, I request uber. The driver arrives at my workplace and I call him to check how far he is and he says he is at my work so I told him that I am coming. As I approach my gate he cancels the trip and I get charged R25. I called him on the same number I had previously called him on and he doesn't answer the calls. I had to request another cab, standing out in the cold. The new uber arrives on time. He drops me home and then he cancels the trip 15 minutes after he had dropped me home and I got billed alot more than what I should have. What is wrong with these uber drivers? They are displaying disgusting and ********** behaviour. I would like to get a refund of the money that was debited and an explanation as to why the driver canceled 15 min later?