UBER DEBITING ACCOUNTS AND NOT REFUNDING FOR TEIPS NOT TAKEN

So this week twice, Uber has taken money for rides that were not done and has not refunded yet. Usually Uber would refund the amounts and this time they haven't. My account still shows the debited amounts and upon querying with uber on the app, I was advised that the trip was cancelled. Be that maybe, the driver cancelled the trip and the amount was debited from my account. This is daylight ******* and I need my refunds! I have no intention of using uber again until this has been resolved. There is obviously an issue with Uber because I see other people complaining about the same problem.