Cheated by taxify driver and company supports drivers actions

Taxify gave me a free ride worth R75 and I used it which my trip was R30 however the driver still made me pay for the ride in cash I reported this to Taxify however it seems like they are condoning their drivers behaviour by ignoring me, all I had requested is my money back but all my attempts are being ignored cause I have communicated with the driver than later Taxify but both parties still ignore me