Mandiri president director Kartika Wirjoatmodjo said on Monday that the bank saw an “extraordinary” volume of transactions last Thursday after a number of big payments piled up, including salaries and holiday bonuses following the end of fasting month of Ramadhan.

“People also made a lot of payments because it [Thursday] was the last working day before the national holiday,” he said.

On that day, Mandiri recorded a surge in transaction volumes to between 45 million and 50 million transactions, far higher than the daily peak volume of around 20 million to 30 million recorded during the corresponding period last year.

On regular days, the bank records an average daily transaction volume of around 12 million to 15 million transactions per day.

Thursday’s overwhelming traffic led to errors in data, with many customers reporting missing funds and unsuccessful cash withdrawals from ATMs. Some customers had their balances reduced despite failing to withdraw any cash.

“We returned [all of the money] the day after,” he said. (ika)

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