To be fair to Bank of Ireland they explain their tracker mortgage portability conditions very clearly on their website.
It would be a bit much to expect that you can refinance another lender's mortgage with an existing tracker.
Sure, the employee gave you the wrong information.
Did you suffer any loss as a result of the wrong information? Were you going to sell your apartment anyway?
Having said all that, you have nothing to lose by going to the Ombudsman who might well tell them to give you a tracker.
Are you sure that you would save that much? The BoI rate is increased by 1% . It's only on the tracker portion of the loan. And it's only for the remaining term of the tracker.
KBC rates are fairly low, so you are probably not losing that much.
You will face the legal fees of moving and maybe early redemption penalties if your KBC is a fixed rate.