The sport of kings.
Fuck knows who does what, when and why at CS. They suspended the account to investigate, decided the hacker didn't get in and unsuspended it.
Some at CS think you can change your username. Some think changing your password will stop somebody with your username from attempting to break into your account in case the password is wrong, for fear of instant electrocution. Some think, including the supervisor, that if you switch to email login you can disable username login. I finally enountered someone who understood that none of these work but just said there's nothing that can be done. She probably didn't realise that the account is unusable. So I've raised it with the escalation team but I think in future I'll just have one round with CS and then go straight to the escalation team.
I sometimes wonder how many people have been driven insane by Betfair CS!