Hi Eilish, you probably know this already, but it's worth re-iterating, from the moment the judge made the bankruptcy order against you in February 2014 you became debt free. You may have chosen to continue paying your mortgage, and that's fine, but all other debts were erased.
The problem is that sometimes creditors are slow to update their computer systems, and maybe the original creditors didn't pass correspondence from the UK's Insolvency Service on to Cabot. So Cabot still thinks you owe money, even though you don't.
You could call Cabot and say "I don't owe this money, I was declared bankrupt". A more comprehensive approach might be to obtain a copy of your credit record from centralcreditregister.ie. There may be other creditors mistakenly recording outstanding amounts and all of them should be contacted and asked to correct their records. It may take a while to get your credit record corrected, but the creditors must update their files to reflect the true position.