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1. As you probably know, under the Data Protection Acts, you must first seek the Data Controller who holds incorrect information about to correct that information. Accordingly, you need to write to each of the credit reference agencies who hold the incorrect information from EE about you and ask them to correct that information, as what they now hold is incorrect. Here is a link to the website of the Information Commissioner which sets this out for you. https://ico.org.uk/for-the-public/is-my-information-being-handled-correctly/.
2. Secondly, you sue EE for defamation. It is defamatory of someone to publish incorrect or false information about them. Here EE published incorrect information about you which directly affected your ability to get credit. So you have suffered damage. Be aware that the level of monetary damages you will receive for a defamation of this nature is about £10,000. So I would suggest you get a solicitor and issue proceedings against EE.
3. Upon repair and correction of your credit file, you will then be able to renew your credit application and have it successfully dealt with.