Unauthorised actions

I noticed that there was an inquiry into my credit status on 31 October (Experian). I am not in the process of opening any new accounts and have not given anyone consent to extract my credit report. I have called you but it is impossible to be directed to right persons and my call have been disconnected twice. It is even impossible to send a complaint via your site. I get the message "There was an error trying to send your message. Please try again later." I expect detail of the purpose and who authorized the credit check?