Uber take almost 48 hours to refund your money. For this, you have to submit the reason. Without any query, you can’t get refund. It depends on your submission. If the reason is suitable then you can get refund within a day.
These are the points you have to follow to check the refund.
1. Tap the main menu.
2. Tap the "Payment".
2. Scroll down and tap to "Uber Credits".
The amount of any credits, related to the cancellation fee refunds, will be displayed there. Keep checking it after your submission for the refund.