The most common reason for a card deposit to be reverted is a temporary connection issue with your bank. It's worth checking with your bank to see if they're currently experiencing any issues with their user authentication systems (3DS).
In this case, you shouldn't be charged. But, if your funds got blocked, it might take your bank up to five working days to process our message and update your balance back to its original level. If you didn't receive your funds back after five working days, please chat to us.