How to dispute an account that isn’t yours on Experian
Spotted an account on your Experian report that you’ve never seen before? Don’t panic — it’s more likely a mixed file than fraud. Experian’s matching algorithms sometimes link someone else’s data to your profile.
Either way, it needs fixing. Here’s how to sort it out with Experian.
Key takeaways
- Free to dispute — your legal right under CCA s.159 and UK GDPR.
- Experian must respond within 28 days.
- Lender has 28 days to respond to Experian’s enquiry.
- Check your Experian report free via Free Experian account.
How to dispute with Experian
Log in to your Experian account and submit a dispute through the contact form. Explain that the account doesn’t belong to you and provide proof of identity (passport or driving licence).
Experian investigates by contacting the lender to verify the account holder’s details. If the date of birth, middle name, or other details don’t match yours, the data is removed.
If you suspect fraud rather than a mixed file, Experian has a Victims of Fraud team.
Experian-specific tips
Experian’s matching algorithms use name, address, and date of birth. If you have a common name and have lived at the same address as someone similar, mixed files are more likely.
Evidence you’ll need
- Gather proof of identity: passport, driving licence, or birth certificate. Add proof of address (utility bills, council tax) and your date of birth and National Insurance number to help Experian distinguish you from the other person.
- Experian’s matching algorithms use name, address, and date of birth. If you have a common name or have lived at the same address as someone with a similar name, mixed files are more likely. Upload evidence through your free Experian account in PDF, JPEG, PNG, GIF, BMP, or TIFF (max 5 MB per file). You can also post to Consumer Help Service, PO Box 9000, Nottingham, NG80 7WP, or email [email protected].
Timeline
Experian contacts the lender to verify the account holder’s details. The lender has 28 days to respond. Mixed file disputes typically resolve within 2–4 weeks once the mismatch is confirmed — if the date of birth, middle name, or other details don’t match, Experian removes the data.
Experian acknowledges disputes within 1–2 working days and adds a “disputed” flag to the entry during investigation.
If your dispute is rejected
If Experian can’t resolve the mixed file, escalate to the ICO. A mixed file means inaccurate personal data is being processed, which breaches UK GDPR. The ICO can order Experian to correct the data.
Experian’s complaints freephone is 0800 013 8888, or email [email protected]. Postal complaints: Customer Relations Team, PO Box 8000, Nottingham, NG80 7WF. If you suspect the account is the result of identity fraud rather than a mixed file, contact Experian’s Victims of Fraud team.
FAQs
Should I report a mixed file to Action Fraud?
No. A mixed file is a data error, not a crime. Only report to Action Fraud if you believe someone has deliberately used your identity.
Can a mixed file happen on Experian but not the other CRAs?
Yes. Each CRA uses different matching algorithms, so a mixed file may appear on one CRA but not others. Always check all three.
Dispute this on another CRA
Other disputes on Experian
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