INSURER Quinn has to refund 20,500 customers after it emerged it failed to give them a promised discount.
The customers were supposed to get a discount for having more than one type of insurance with the company.
It is the latest in a long list of overcharging scandals featuring banks and insurance companies.
Contacted yesterday, Quinn Insurance, which has been in administration for more than a year, admitted to the Irish Independent it had overcharged its customers.
"Quinn Insurance Limited (under administration) confirms that, as part of a recent routine evaluation of processes and procedures, it identified an error which resulted in some customers with multiple policies not having their multi-product discount correctly applied," it said.
Refunds had been issued to all 20,500 affected non-commercial customers, to ensure that they were fully reimbursed, the company added. The average refund amount is €63 per customer.
A spokesman for the insurer insisted it had now introduced a number of new "control mechanisms" to ensure it did not slip up again.
The Central Bank said it had been notified and urged all firms that discover that they have overcharged their customers to issue refunds speedily.