This made me LOL. How can they deny it when there's no other possible explanation? Caught red handed and they bloody know it.
Dear Mr [deleted]
Thank you for your recent correspondence.
We would advise that we do not sell onto third parties the information that is provided to us as part of the credit file application process, which includes email addresses.
We treat data security extremely seriously and the concerns you have raised have been communicated to our Information Security Director.
Should we wish to contact you regarding this matter, we would be grateful if you could provide a daytime telephone number on which you can be reached.
I hope the above details are of assistance to you.
Kind Regards
Neil White MyEquifax Customer Care Team