Tens of thousands of ANZ customers are receiving their benefit and superannuation payments a day later than usual after the bank merged with the National Bank.
Although ANZ took steps to contact affected customers, not all were told, leaving some distressed and hungry after the changes came into effect on Tuesday night.
A 48-year-old Wellington sickness beneficiary from Island Bay, who only wanted to be known as William, said he had no notification of the change.
''As a sickness beneficiary, I get my benefit but I also pay child support out of that so I actually only end up with just over $200 a week to pay my rent and all my food and bills.''
So by Tuesday usually I haven't eaten anything because I've run out of money.''
William, who can't afford a mobile phone, said that since going on a benefit in March, his payment had been available at 7.15pm on a Tuesday night.
This week it wasn't available until Wednesday morning.
''Suddenly it changed and I was left high and dry with no food. I was very upset.''
After waiting on hold for 35 minutes, William finally got through to ANZ's helpline and was told the change was permanent.
''Basically it's a another day without money. Beneficiaries are used to getting their money at a certain time and plan things like food and transport around it.''
Beneficiary Advocacy Federation spokeswoman Kay Brereton said those who weren't told thought their payments hadn't gone through.
''They think something has gone wrong with their benefit. They don't know it's something with the bank.
''Some beneficiaries, usually those with mental health issues, waited at money machines for their payments to go into their accounts.''
They are the people who are really going to be thrown by this kind of stuff.''
ANZ retail managing director Kerri Thompson said payments for beneficiaries and superannuitants with ANZ accounts had previously been available between 6pm and midnight the evening before they were due.
From this week they would be available from 4am to 5am on the day they were due, rather than the evening before when the Ministry of Social Development (MSD) paid them into banks.
Payments for those with other banks, including National, had always had their payments available the following morning and the changes brought ANZ in line with the rest of the institutions, she said.
ANZ began notifying customers two weeks ago.
''We advised 75,000 customers by text, sent letters to a further 15,000 and had a message on our Contact Centre line advising customers of the change.
We also kept MSD fully informed.''No automatic payments or direct debit payments would be affected by the change, Mrs Thompson said.
A MSD spokeswoman said the responsibility lay with ANZ.''That's the way that ANZ processes the payments. We didn't make any changes.''
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