Charged twice for the same trip.

Yesterday I used Uber to get to the hospital. I used my card to pay for the ride and I was charged twice for the same trip. 1st for the amount of R140 and half an hour later l was charged again for the amount of R145. I have seen numerous emails to Uber to rectify the problem but to no avail. This morning I went to the bank to check my account and they had informed me that I was charged twice for the total amount of R285. It's been a very unpleasant experience.