Default incorrectly on credit file

rosswill

Hello, newbie question so apologies if it's been covered previously.
Wonder if someone can advise the best form of action?
In January 16 I noticed a linked address I didn't recognise listed on my Equifax credit file for a contract with O2 taken out in August 2015. I contacted Equifax who said the data was entered correctly and that I needed to take this up with O2. I contacted the O2 fraud department and eventually having been messed around the FOS. This resulted in an undertaking by O2 to delete the credit file entry and issue a cheque for £25 as a good will gesture. In March I was surprised to see 2 defaults had been placed on my file resulting in a 140 point drop in my credit score. This again listed the unknown address and the same O2 contract debt, now owned by a debt collection agency. I have been in contact with all parties. Equifax refuse to help. Debt collection agency said it may be a miss-trace but now insist the data is correct. O2 are not replying. What am I supposed to do and how can this even be possible?
To confirm. The debt is not mine. I have never been a customer of O2. I have no association with the linked address having been resident elsewhere for over 10 years which a simple electoral registry search would confirm. To say I am annoyed with the treatment I have received from all parties is an understatement!
Thanks for any advice anyone has to share.

fermi

Complaint to the debt collection agency and O2, stating you will take them to their ombudsman and will consider legal action against them if not removed.