Duplicate transactions

I booked a ride with Uber on 8 Dec. After the trip the transaction went off my bank account. Yesterday I noticed that the transaction was duplicated. So meaning Uber charged me twice for one trip. Uber states they are not able to assist as they can't see the payment on their side. I have sent them all the details they are asking for like last 4 digits of card, bank statement, and still they won't give my money back. I see there are a few other people also complaining about unauthorized charges and duplicate transactions on Uber. Imagine how much money they are making from this as many people don't notice these charges especially over festive season and even people who couldn't be bothered with the effort that it takes. Uber, just give my money back. How can I possible have been on two Uber trips at the same time?