Random phone call demanding payment of loan with no details except amount allegedly owed

Got a phone call from an Irish mobile phone number this afternoon. Hi I’m ***** from Pepper I’m calling to give you an opportunity to talk with us about this loan before I hand it over to the legal team to process the judgement. I have no loans that are in arrears, so ask what he is actually talking about. For background I have had no comms about anything like this in the last 10 years, my CCR is completely clean, recently checked. I asked him to phone me back in one hour with the details. He called back and was still only able to tell me the debt was against a property long since disposed of, the amount was 23k and he was instructed to settle for 15k to close the matter. He mentioned my ex husband’s first name, a maniac gambler who i finally got divorced from 2 years ago and who I have not had any financial dealings with for more than 20 years - I have not signed anything he put in front of me in all that time. Whatever this is it’s circa 20 years old, they have not initiated any debt recovery process in the interim.
The guy was not able to tell me what the property address was, I asked him in the first phone call and again in the second. I have not owned or been party to a mortgage on a property in more than 20 years. My question - are they statute barred? Seems like this guy googled my name, found I have a good job and is taking a punt on making his bonus. Thanks for any advice. It has been a mammoth job getting back on my feet, single parent of child with complex special needs and zero support network due to ex’s outrageous behaviour. This would be a huge setback to us.