This might help, but equifax got hacked in May 2017, and personal information was stolen, and from the letter I received yesterday from them they have taken usernames for equifax services, addresses, telephone numbers. So I would get in touch with them as well.
You can’t put a password on a credit file, (as it’s publically accessible by any legimate organisation including your employer)but a paid for marker called a CIFAS marker, can be applied to your credit file, telling the request to be aware and ask more details,
Unfortunately if they have all the proofs, name, address, credit file and they all match, then I’m afraid they will say it’s you as the evidence will come to that conclusion.
Unfortunatley Identity theft is rising, and becoming more common.
As
@MI5 has said try CItizens Advice and Trading Standards.
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This is not customer services and we dont have access to your account
I do not work for o2 or any VMo2 /Telefonica/Liberty Global Company