Over 100 customers of KBC bank claim they have been wrongly moved off low interest tracker loans.
RTÉ News has seen documents which were circulated to mortgage brokers which stated customers of the bank would revert to tracker loans after their fixed rates ended.
However, some customers claim they were blocked from returning to the low interest loans.
KBC is the latest in a series of banks which may have questions to answer as part of the Central Bank's review of how financial institutions moved some customers to more expensive standard variable loans.
Financial advisor Padraic Kissane says he is acting on behalf of more than 100 customers who believe they were wrongly moved from tracker rates.
Mr Kissane is compiling a report on the issue on behalf of clients which will be sent to the Central Bank.
Already Permanent TSB, AIB and Ulster Bank have admitted they are facing similar issues.
KBC Bank, which was called IIB up to 2009, conducted much of its business through mortgage brokers.
In November 2006 the bank sent brokers a circular entitled "Fantastic News from IIB Homeloans."
It said: "All IIB Homeloan fixed rates will now roll onto tracker rate upon expiry. Offering your clients even better value."
The document will form part of Mr Kissane's report to the Central Bank on behalf of clients.
Over 100 KBC customers have claimed they were wrongly moved off low interest tracker loans - @davidmurphyRTE reports https://t.co/ydeM45QUa2
— RTÉ News (@rtenews) May 12, 2016
In a statement to RTÉ News the bank said: "KBC is progressing with the tracker review process and timings as set out by the Central Bank of Ireland and has no further comment to make at this stage."
It is understood the bank has hired consultancy Deloitte as part of its review for the Central Bank.
Sources close to the bank indicate that if there are cases where customers should be returned to tracker rates the bank will do so.
KBC (IIB) customers wrongly moved off trackers. This doc shows they shouldn't have been. https://t.co/vy3jNCLByo pic.twitter.com/GydgRLA59W
— David Murphy (@davidmurphyRTE) May 12, 2016
