ANZ Bank’s head of marketing and products Matthew Boss has promised customers more “frequent and rampant” changes to online banking services in the next year.

In an interview published by iTnews on Tuesday, Mr Boss indicated that the launch of a new internet banking site at the weekend was only the start of a sweeping overhaul of online services provided by the bank.

“When we did it we wanted to make sure we did it right: everything from the intuitive nature that comes with all good digital experiences, and being very clear that we know customers interact with us from a number of devices throughout the day,” he said.

• ANZ upgrade triggers online banking chaos
• Comment: An interest rate lull before a stormy 2016
• We rank highly on money smarts. Test yourself here.

“We wanted to create that consistent experience.

“The biggest change to internet banking is that it’s responsive – that’s critical from a user experience.”

Mr Boss’ comments came as hundreds of ANZ customers called on the bank to revert to old user interfaces for internet banking after the new systems crashed on Monday.

Customers were locked out of the internet banking service for nine hours as ANZ’s IT staff battled to remedy the meltdown.

Customers aren’t happy with the new ANZ online banking interface.

ANZ customers are telling the bank on its Facebook page that the user interface for the new online service is “a waste of space”, “complicated” and “overdone”.

One customer told the bank: “I hate the new site, you can’t see many transactions on the one screen at the same time. What idiot came up with the design! Go back to the old one, so much more user friendly.”

Another customer said: “This new layout is absolutely horrible!”

The disconnect between Mr Boss’ aspiration for more changes and the loyalty of customers to the old online interface has created a big marketing challenge for the bank.

ANZ has a lot riding on the technology overhaul, having invested more than $1 billion in the past year on its IT strategy and transforming its digital banking systems.

In June the bank announced it had appointed a panel of digital experts, including executives from Twitter and PayPal, to advise the ANZ board on the latest developments in online banking.