It also claimed MAS did not apply the multi-policy discount or incorrectly applied a lower rate of the discount to premiums owed to 8,800 customers resulting in $3.3m in overcharged premiums ($3.8m has been reimbursed).
It also claimed MAS made various errors when manually calculating benefit payments to more than 100 customers resulting in $1m in underpayments (over $1.1m has been reimbursed).
And it claimed MAS did not apply the correct no claims bonus grade to premiums owed by over 1,200 eligible customers resulting in nearly $600,000 of overcharged premiums (more than $600,000 has been reimbursed).
The FMA claimed MAS’s failures were due to errors and deficiencies in its systems, including data entry errors by employees.
It acknowledged that MAS has been cooperative with the regulator through its investigation since disclosing the issues.
The FMA is seeking a declaration that MAS contravened the Financial Markets Conduct Act and a pecuniary penalty.
The proceedings were filed at the High Court in Wellington.