Uber refuses to pay me back for trips I did not take!

About 2 months ago, a driver canceled my ride of which I had already paid for as he said he was too far and wanted me to cancel as he would still get the money. I refused and told him to cancel. Thereafter he did however I was double debited of R79 and Uber refused to refund me. With no contact details and using the support option to try talk to someone who is of no help, I was appalled as I am still to be reimbursed. Last night I then desperately needed a lift so I ordered an Uber again, I eventually canceled it as a close friend offered to lift me (of which I was more comfortable with) however when I canceled they charged me a R55 cancellation fee as well as the R133 that was already paid. I am once again, yet to be reimbursed, this time with no response from their support team. I am a hard working person who earns minimal income, this kind of service infuriates me as it is taking advantage of people. If this has happened to me already twice, I would hate to see how many other people have had this same situation! I can only imagine how many people that have been ****med like this and just how much money Uber has ****** like this. I WILL NEVER use Uber again.