Overcharged on every trip

My friends and I used Uber the other evening. On each trip the final charge on my credit card was more than double the provided estimation before the trip. I understand this is an estimation but then I expect the difference to maybe be 10% on either side, not 150% difference. If we had known it would cost that much we may have opted not to take it. But we are not even given this option, we get out of the car then have to pay whatever Uber deem fitting. Then there is no way to dispute the amount. Uber have no contact info on their website and it is not on their very limited support list. This is not fair on the consumer.<br> <br> Also, there was no surcharge warning and the driver did not take a bad route since I know the route well. I would be happy to discuss this further with Uber if they would ever call me.