A number of OP bank customers were double-charged for purchases and withdrawals made during three days in December last year.
OP Financial Group confirmed on Monday that a technical problem led to charging a number of its banking customers twice for payments and withdrawals made during three days last month.
It is still unknown how many OP customers were affected by the technical glitch, the bank said on Monday.
The bank said that it pinpointed the technical problem that caused the issue on Monday morning.
On Monday the bank advised customers to contact support staff if they do not have adequate funds for the day.