Send an e-mail to Uber and request a refund of the difference.

More insidious than the way they monkey with (and hide) surge pricing and more expensive routings IMO is that they quote you a fare up front and then don't always honor it. I have a friend who has multiple times been charged a higher fare than he was initially quoted even though he took the most direct route and there wasn't any additional traffic. An e-mail to customer service usually fixes it, but you have to remember to screenshot the original fare quote because otherwise there's no way to know what the original quote was.

I try to avoid Uber and use Juno (in NYC) and Lyft instead.