Thousands of St George Bank customers have been unable to use online, mobile and telephone banking services for over 24 hours.
The system failure has come during a long weekend in NSW, Queensland, South Australia and the ACT, with bank branches closed today for Labour Day.
St George says customers can still get funds through ATM and EFTPOS services as well as their credit card.
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“Our teams are working to fix this as soon as possible,” St George Bank posted on Facebook on Monday.
“Please accept our apologies for the disruption, and we’ll continue to update you as services are restored.”
Customers have voiced their frustration and anger on social media.
“5:30am! Can’t pay for our hotel and have our flight in 2 hours! This is absolutely unacceptable,” one wrote on Facebook around 8am on Monday.
“I accepted yesterday. But waking up to it not working makes me question your professionalism.”
The bank first notified customers of the problem via Facebook on Sunday and later released a statement saying customers could still obtain funds through ATMs, EFTPOS and their credit card.
“The problem has arisen following a regular upgrade to the bank’s computer systems over the weekend,” it said.
Customer complaints include not being able to transfer funds between accounts.
“I’m in Melbourne and I don’t have any money, so I’ve been needing to transfer some across since yesterday afternoon,” Lauren Knight-Smith told AAP on Monday.
“It’s just irritating because I haven’t been able to eat or go out or do anything for almost 24 hours.”
A St George bank spokeswoman said the issue will hopefully be resolved by Monday afternoon.