o2 removed default, however Lowell aren't removing it as agreed with o2?

[KL2]

Quick q for everyone, in 2015 I defaulted on an account and agreed with o2 in 2018 to remove it as I paid it in full immediately after realising it defaulted (my fault but they agreed as I was a long time customer).

They told me to contact Lowell (who bought the debt) to get them to remove the default from their end, and every time I've spoken to them they tell me they will get it done but then it never ends up happening and it's been almost a year now.

What can I do? I have the original emails from o2 complaints saying it's fine for Lowell to remove it as they have now done, but Lowell have not yet actioned this after a year still. I've just sent another email saying I'll allow 28 days but then will raise it with the ICO... but I fear they'll just ignore me again.

[luxardo]

First off they have no legal requirement to remove a default notice unless it's inaccurate.
However if you have proof they said they would and they haven't then take it up with the Financial Ombudsman Services.
You have just sent them another letter so wait the 28 days and make a complaint.