Please email support at firstname.lastname@example.org or click here. They will fix your email for you. Prove you are indeed the owner of the account by sending the current account email and the CDKEY you registered to the account, or if you bought on STEAM, send your steamID.
You can find your steamID by opening steam application, clicking on your name at the top (next to store), and selecting PROFILE from dropdown menu. Then copy paste URL that it opened into email that you are sending to support.