Letter from Intrum

[RSC]

I have received a letter out of the blue from Intrum claiming that they now own a debt I have had with a creditor for over 10 years. I have been making regular token payment to which they acknowledge that I have an ongoing agreement. They also supply a copy of the PDF letter from the creditor confirming that my debt is transferred. They make to my balance and payment up to October 2018.

I have not received anything directly from the creditor regarding this. I have written to the creditor for an explanation. Should I also ask Intrum for my credit agreement? Is there anything else I need to do. Intrum also claim they will update my credit file. This debt was not on my file as it fell off years ago.

[charitynjw]

The letter from Intrum is probably a Notice of Assignment (re the Law of Property Act 1925).
Either the original creditor, or the assignee (Intrum), or sometimes both, can send this notice, & once received by the debtor, the rights of the original creditor pass to the assignee.

You mention 'credit agreement'.
If it is a regulated agreement, it will be covered by the Consumer Credit Act 1974 as well as the original terms & conditions (& possible variations to them).
It would help if we knew what the agreement was for. (Credit card, loan etc.)