The country's largest bank has experienced a series of problems with its technology this year.
On August 11, it suffered intermittent outages to its Eftpos services, leaving many shoppers around the country unable to make purchases.
Some customers later found they had been charged multiple times for the same transaction and many turning to social media for answers.
In mid-April, a glitch caused overnight payments to be held up and denied ANZ customers of access to internet banking.
On January 31, a nationwide fault left many of the bank's customers unable to use their credit and direct debit cards over lunchtime.
ANZ says the problems have nothing to do with its technology merger with National Bank last October.