Stole R427 from me with a voucher

On the 19th of February I spent a few hours trying to place an order and the app kept saying choose a different payment method even though I had my card added on it. Then I proceeded to buy an Uber eats voucher to the value of R427. A little over what is needed for the order. I loaded it and tried again, still same problem. I contacted support who gave me solutions which did not work (add a new card, didn't work, kept saying problem processing, tried uninstalling and reinstalling, nothing worked) and I kept trying over and over. After 7 hours I told them I am still having the same problem and even sent screenshots but then I was told they can not help me and it is now the end of discussion. And they will not be replying anymore to my query/problem. I am unable to refund my voucher or place an order. Uber eats basically stole R427 from me. I am disgusted. Uber eats are *******.