Internet banking on the BNZ website has been restored, but many customers have been left with a foul taste in their mouth following the outage.
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The bank reported problems with its internet banking and mobile app earlier this week. After announcing on Monday the problems had been resolved, internet banking was again unavailable on Wednesday.
Many customers vented their frustration at the patchy service on the bank's Facebook page, saying they were considering changing banks.
"We also just moved over to BNZ from ANZ and we've had nothing but problems with this app. It wasn't even that great to begin with! Why have there been so many issues with it? Anyone recommend another bank - I'm over this!" wrote one person.
Another customer called the outage "next level".
"I'm going to look at other banks. This is too old fashioned and too inconvenient," the person wrote. "Sorry BNZ really poor 'service'."
The bank said that service had been fully restored to its internet and mobile banking on Thursday night but there continued to be an impact on MYOB and XERO data feed functionality.
A BNZ spokesperson apologised to customers for the inconvenience.
"It was caused by an issue in our server environment affecting how some elements were talking to each other," the spokesperson said.
"As part of the fix, we had to restart some of our internet banking services, which caused some periods of downtime."
Newshub.
