The payment system QIWI has introduced an intelligent system that delays transfers by 48 hours, and in 80% of cases cancels them and sends them back to the sender’s account.
Information from Banki.ru

If you have chosen this direction of exchange and your payment has been frozen for 48 hours, then the application will not be executed, since the money will not be received by us. Remember the application number and contact the operator in the chat after the specified time, we will solve the problem – we will execute the application at the current rate or make a refund minus 3% of QIWI PS from the amount received.
After reading this warning and going to the exchange page, you automatically agree that your funds may freeze, if you do not agree with the hold from the QiWi payment system, sеlect another exchange direction.
P.S. If after freezing your funds you receive a call from QIWI SB, do not tell them that you are acquiring bitcoins, as the Bank of QIWI OJSC does not welcome this.