Westpac says it's remediated all customers who were misled or overcharged by package issues

The Financial Markets Authority says the bank's breaches of the fair dealing provisions affected almost 25-thousand customers and resulted in 6.35-million-dollars in overcharges.

A Westpac spokesperson says it self-reported the issues which applied to customers under some product packages and Business Transact Accounts.

They say it's cooperated fully and openly with the FMA's investigation.

A penalty hearing is likely due some time next year.