Seems to be if I mention default notice they say enforcement notice and gave me a date before it was placed on my credit file

Have spoken to lloyds again today and now saying letter that was sent was a notice of enforcement is this the same as a default notice

Looking for some help Had a lloyds bank account a few years ago which was in agreed overdraft I moved house and informed all my creditors lloyds decided to cancel overdraft and ask for money back letters were sent to old address so they say and I was defaulted I honestly never received it and only knew about a year later when I checked my credit file and paid account off. I have asked them to for a copy of the notice which they say they haven't got but their computer says it was sent they won't remove default but I was never given opportunity to pay off. Do they have to keep copies of default notice Thanks