In such case, first of all login to your Paysera account and check Visa card account balance:

• if the amount is reserved, but has not been debited yet, we recommend waiting a bit. It is often the case that the bank in whose ATM cash withdrawal took place, having checked the balances at the ATM and found discrepancies, simply cancels the reservation. Once the reservation is cancelled, the money are no longer debited.
• if the money was debited from Visa card account, please immediately contact the Client Service Center.