Ulster Bank denies it broke the law over the tracker mortgage scandal.
3,500 people were wrongly removed from a tracker rate by the bank.
Of those, 15 customers lost their own homes because of the move.
Sinn Féin TD Pearse Doherty asked Ulster Bank CFO Paul Stanley whether he thought his bank had broken the law on this issue.
He said: "The contractual view is that it wasn't broken but that is not the issue here is that it was ambiguous from a customer perspective."
Ulster Bank says it has been in contact with the 15 or so people who lost their homes because of the tracker mortgage scandal.
Some of them have received cheques from the bank to the value of around €50,000.
Those customers may get more redress, but only one of the properties taken is still in Ulster Bank's possession.
Bank officials are before an Oireachtas committee this morning.
Executives from Ulster Bank are expected to face a grilling when they appear before the Finance Committee later.
They will be asked questions about the bank's progress in dealing with the tracker mortgage scandal.
A leaked questionnaire completed by Ulster Bank has revealed that 15 families lost their homes as a result of being denied or removed from tracker rates.
Ulster Bank is expected to say it has returned 2,500 customers back to the correct rate.
But it is understood the Bank has only paid compensation to just over 1,000 of those mortgage holders.