Uber took my money and isn't refunding me

Uber deducted 480 off of my account as a pre authorized hold. Usually what this means is. They take it off before you take a trip for them to see if you have enough money in your account to take the trip and pay for it. And immediately after they put it back and only take it out after the trip is completed. They never put the money back into my account and I couldn't take the trip. I phone multiple times and they said they looking into it. 20 days later I still dont have my money and they keep saying someone is looking into it. And they won't email me saying they didn't receive the money for me to forward it to my bank so that my bank can reverse it. They are so bad at customer service and I'm never using it again. Don't use Uber! They take money and don't give you anyway to help get your money back!